Donald Trump v. Mazars USA, LLP ( 2019 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued July 12, 2019               Decided October 11, 2019
    No. 19-5142
    DONALD J. TRUMP, ET AL.,
    APPELLANTS
    v.
    MAZARS USA, LLP AND COMMITTEE ON OVERSIGHT AND
    REFORM OF THE U.S. HOUSE OF REPRESENTATIVES,
    APPELLEES
    Appeal from the United States District Court
    for the District of Columbia
    (No. 1:19-cv-01136)
    William S. Consovoy argued the cause for appellants. With
    him on the briefs were Cameron T. Norris and Stefan C.
    Passantino.
    Duane Morley Cox, pro se, filed the brief for amicus
    curiae Duane Morley Cox in support of appellants.
    Douglas N. Letter, General Counsel, U.S. House of
    Representatives, argued the cause for appellee Committee on
    Oversight and Reform of the U.S. House of Representatives.
    With him on the briefs were Todd B. Tatelman, Deputy General
    Counsel, Megan Barbero and Josephine Morse, Associate
    2
    General Counsel, and Brooks M. Hanner, Assistant General
    Counsel.
    Elizabeth B. Wydra, Brianne J. Gorod, and Ashwin P.
    Phatak were on the brief for amicus curiae Constitutional
    Accountability Center in support of intervenor-defendant-
    appellee Committee on Oversight and Reform of the U.S.
    House of Representatives.
    Hashim M. Mooppan, Deputy Assistant Attorney General,
    U.S. Department of Justice, and Mark R. Freeman, Scott R.
    McIntosh, and Gerard Sinzdak, Attorneys, were on the brief as
    amicus curiae The United States.
    Before: TATEL, MILLETT and RAO, Circuit Judges.
    Opinion for the Court filed by Circuit Judge TATEL.
    Dissenting opinion filed by Circuit Judge RAO.
    TATEL, Circuit Judge: On April 15, 2019, the House
    Committee on Oversight and Reform issued a subpoena to the
    accounting firm Mazars USA, LLP for records related to work
    performed for President Trump and several of his business
    entities both before and after he took office. According to the
    Committee, the documents will inform its investigation into
    whether Congress should amend or supplement current ethics-
    in-government laws. For his part, the President contends that
    the Committee’s investigation into his financial records serves
    no legitimate legislative purpose, and he has sued to prevent
    Mazars from complying with the subpoena. The district court
    granted summary judgment in favor of the Committee, and we
    affirm. Contrary to the President’s arguments, the Committee
    possesses authority under both the House Rules and the
    Constitution to issue the subpoena, and Mazars must comply.
    3
    I.
    Shortly after the 116th Congress convened on January 3,
    2019, the new U.S. House of Representatives debated and
    adopted a set of rules to govern its proceedings. See H.R.
    Res. 6, 116th Cong. (2019). Like previous Congresses, the
    116th established an oversight committee, the Committee on
    Oversight and Reform, which it charged with “review[ing] and
    study[ing] on a continuing basis the operation of Government
    activities at all levels” and which it permitted to “conduct
    investigations” “at any time . . . of any matter,” “without regard
    to” other standing committees’ jurisdictions. Rules of the
    House of Representatives, 116th Cong., Rule X, cls. 3(i),
    4(c)(2) (2019) (“House Rules”); see also 
    id., cl. 1(n)
    (establishing the Committee on Oversight and Reform). To
    “carry[] out . . . [these] functions and duties,” the Oversight
    Committee may “require, by subpoena or otherwise . . . the
    production of such . . . documents as it considers necessary.”
    House Rule XI, cl. 2(m).
    This case concerns one such subpoena. Issued on April 15
    by the chairman of the House Committee on Oversight and
    Reform, Representative Elijah Cummings, to President
    Trump’s accounting firm, the subpoena requests financial
    documents concerning the President and his companies
    covering years both before and during his presidency.
    In order to explain the impetus behind the subpoena, we
    must go back to the Ethics in Government Act of 1978. Enacted
    in the wake of the Watergate scandal, that statute requires many
    aspiring and current government officials, including
    presidential candidates and sitting Presidents, to file financial
    disclosure reports at various times during their candidacies and
    incumbencies. See 5 U.S.C. app. 4 § 101(a), (c), (d), (f)
    (requiring “a candidate . . . for nomination or election to the
    office of President” and “the President” to “file a report
    4
    containing the information described” in section 102 of the
    Act). In their initial reports, presidential candidates and new
    Presidents must provide information concerning their income,
    assets, liabilities, and employers. See 
    id. § 102(b)
    (requiring
    “[e]ach report filed pursuant to subsections (a), (b), and (c) of
    section 101” to contain such information). Once in office,
    sitting Presidents must file annual reports disclosing that same
    information plus details about any covered gifts, real estate and
    securities transactions, and blind trusts. See 
    id. § 102(a)
    (requiring “[e]ach report filed pursuant to section 101(d) and
    (e)” to contain such information). Presidential candidates
    submit their reports to the Federal Election Commission, see
    
    id. § 103(e),
    while incumbent Presidents file with the Office of
    Government Ethics, an “executive agency” tasked with
    “interpreting rules and regulations . . . governing . . . the filing
    of financial statements,” 
    id. §§ 103(b),
    401(a), 402(b)(3),
    402(b)(6).
    Last year, the Office of Government Ethics announced that
    it had identified an error in one of the several reports that
    President Trump had filed since he became a presidential
    candidate in 2015. Specifically, by letter dated May 16, 2018,
    the Acting Director of the Office of Government Ethics advised
    the Deputy Attorney General that, “based on the information
    provided” in President Trump’s 2018 financial disclosure
    report (covering calendar year 2017), he had determined that
    the President’s 2017 financial disclosure (covering calendar
    year 2016) omitted “a reportable liability under the Ethics in
    Government Act,” namely, “a payment made by Mr. Michael
    Cohen,” President Trump’s former personal lawyer, “to a third
    party.” Letter from David J. Apol, Acting Director, Office of
    Government Ethics, to Rod J. Rosenstein, Deputy Attorney
    General, Department of Justice 1 (May 16, 2018) (“Apol
    Letter”). Because President Trump’s 2018 filing disclosed that
    in 2017 the President had reimbursed Cohen for the 2016
    5
    payment, the Acting Director concluded that “the payment
    made by Mr. Cohen [was] required to be reported as a liability”
    before it was reimbursed. 
    Id. at 1;
    see also OGE Form 278e,
    2017 Annual Report for Donald J. Trump, Part 8 n.3 (May 15,
    2018),       https://oge.app.box.com/v/Trump2018Annual278
    (disclosing that “Mr. Trump fully reimbursed Mr. Cohen in
    2017”).
    Several months later, then-Ranking Member Cummings
    wrote to White House Counsel seeking documents related to
    President Trump’s payments to Cohen. See Letter from Elijah
    E. Cummings, Ranking Member, House Committee on
    Oversight and Reform, to Donald F. McGahn II, Counsel to the
    President, The White House, and George A. Sorial, Executive
    Vice President of the Trump Organization 4–5 (Sept. 12, 2018).
    That letter remained unanswered as of January 2019, when
    Representative Cummings, who in the intervening months had
    become Chairman Cummings, reiterated his request in a
    second letter. See Letter from Elijah E. Cummings, Chairman,
    House Committee on Oversight and Reform, to Pat Cipollone,
    Counsel to the President, The White House 1–2 (Jan. 8, 2019).
    Chairman Cummings also wrote to the new Director of the
    Office of Government Ethics, asking him, too, for “documents
    related to President Donald Trump’s reporting of debts and
    payments to his personal attorney, Michael Cohen.” Letter
    from Elijah E. Cummings, Chairman, House Committee on
    Oversight and Reform, to Emory A. Rounds III, Director,
    Office of Government Ethics 1 (Jan. 22, 2019).
    In February, White House Counsel responded that the
    President would consider permitting the Committee to review,
    on a limited basis, a subset of the requested documents, but
    Chairman Cummings rejected this proposal as inadequate. See
    Letter from Elijah E. Cummings, Chairman, House Committee
    on Oversight and Reform, to Pat Cipollone, Counsel to the
    6
    President, The White House 1 (Feb. 15, 2019) (“Cummings
    Feb. 15 Letter”) (stating that the President’s offer to “consider
    providing Committee staff with the ability to review limited
    portions of two of the six categories of documents in camera”
    would “not obviate the need . . . to fully comply” (internal
    quotation marks omitted)). Citing the Oversight Committee’s
    status as “the authorizing Committee for the Office of
    Government Ethics,” the President’s statutory obligation to
    “file . . . public financial disclosure report[s],” and Congress’s
    “plenary authority to legislate and conduct oversight regarding
    compliance with ethics laws and regulations,” Chairman
    Cummings urged the White House “to provide documents
    relevant to the Committee’s investigation of these matters.” 
    Id. at 7–8.
    “These documents will help the Committee determine,”
    he explained, “why the President failed to report . . . payments
    and whether reforms are necessary to address deficiencies with
    current laws, rules, and regulations.” 
    Id. at 9.
    Two weeks later, Michael Cohen appeared at a hearing
    before the Oversight Committee. See Hearing with Michael
    Cohen, Former Attorney to President Donald Trump: Hearing
    Before the House Committee on Oversight and Reform, 116th
    Cong. (Feb. 27, 2019). He testified that he believed, based on
    his experience working for President Trump, that the President
    had “inflated his total assets when it served his purposes” in
    some situations and had “deflated his assets” in others. 
    Id. at 13
    (testimony of Michael D. Cohen). Several Committee
    Members questioned Cohen’s credibility; he had, after all,
    recently pleaded guilty to various crimes, including lying to
    Congress. See, e.g., 
    id. at 7
    (statement of Ranking Member Jim
    Jordan) (“This might be the first time someone convicted of
    lying to Congress has appeared again so quickly in front of
    Congress.”); 
    id. at 57
    (statement of Rep. Michael Cloud)
    (asking Cohen to “state what you’ve been convicted of”).
    Seeking to support his testimony, Cohen produced to the
    7
    Committee several accounting documents, all of which
    predated Mr. Trump’s presidency. Two of these documents—
    2011 and 2012 “Statements of Financial Condition” for Donald
    J. Trump—were prepared by Mazars. See “Donald J. Trump
    Statement of Financial Condition” dated June 30, 2011;
    “Donald J. Trump Statement of Financial Condition” dated
    June 30, 2012.
    Chairman Cummings next wrote to Mazars. In a March
    2019 letter, he explained that the statements of financial
    condition prepared by the firm and supplied by Cohen had
    “raise[d] questions about the President’s representations of his
    financial affairs,” “particularly [his] debts,” “on these forms
    and on other disclosures.” Letter from Elijah E. Cummings,
    Chairman, House Committee on Oversight and Reform, to
    Victor Wahba, Chairman and Chief Executive Officer, Mazars
    USA, LLP 1 (Mar. 20, 2019) (“Cummings Mar. 20 Letter”).
    Chairman Cummings highlighted several “specific concerns,”
    including: (1) that “[t]he 2012 Statement of Financial
    Condition prepared by [Mazars]” intentionally omitted over
    $50 million in assets and $75 million in liabilities that “then-
    Candidate Trump” later disclosed on his “first publicly filed
    financial disclosure made . . . in 2015,” (2) that read together,
    the 2012 statement of financial condition and 2015 financial
    disclosure indicated that Deutsche Bank had reduced the
    interest rate it was charging on a $125 million loan to then-
    Candidate Trump, potentially saving him “about $625,000”
    each year, and (3) that “both the 2011 and 2012 financial
    statements” noted that, before becoming a presidential
    candidate, Mr. Trump “ha[d] pledged” almost $20 million to a
    “former partner in the Trump World Tower at United Nations
    Plaza,” who, “[a]ccording to contemporaneous reports,” was
    possibly “the Korean conglomerate Daewoo” or a “German
    financial institution.” 
    Id. at 2–3.
    “To assist [its] review of these
    issues,” the Committee requested several categories of
    8
    documents relating to President Trump’s accounts going back
    to January 2009. 
    Id. at 4.
    Mazars responded that it could not provide the requested
    documents voluntarily. See Letter from Jerry D. Bernstein,
    Partner, Blank Rome LLP, to Elijah E. Cummings, Chairman,
    House Committee on Oversight and Reform 1 (Mar. 27, 2019).
    So, on April 12, Chairman Cummings sent a memorandum to
    his fellow committee members explaining his intention to
    issue, pursuant to the Committee’s authority under House Rule
    X to “investigate ‘any matter at any time,’” a subpoena to
    Mazars. Memorandum from Chairman Elijah E. Cummings to
    Members of the Committee on Oversight and Reform 3
    (Apr. 12, 2019) (“Cummings Memo”). The Chairman
    identified four subject matters that, in his view, “[t]he
    Committee has full authority to investigate”: (1) “whether the
    President may have engaged in illegal conduct before and
    during his tenure in office,” (2) “whether [the President] has
    undisclosed conflicts of interest that may impair his ability to
    make impartial policy decisions,” (3) “whether [the President]
    is complying with the Emoluments Clauses of the
    Constitution,” and (4) “whether [the President] has accurately
    reported his finances to the Office of Government Ethics and
    other federal entities.” 
    Id. at 4.
    “The Committee’s interest in
    these matters,” he stated, “informs its review of multiple laws
    and legislative proposals under [its] jurisdiction.” 
    Id. The subpoena
    issued three days later. It requested, “[w]ith
    respect to Donald J. Trump” and several of his affiliated
    businesses—including the Trump Organization, the Trump
    Corporation, and the Trump Old Post Office LLC—“[a]ll
    statements of financial condition, annual statements, periodic
    financial reports, and independent auditors’ reports prepared,
    compiled, reviewed, or audited by Mazars . . . or its
    predecessor.” Subpoena to Mazars USA, LLP, Apr. 15, 2019
    9
    (“Subpoena”). Furthermore, with respect to Mazars’s
    “preparation, compilation, review, or auditing” of those
    documents, the subpoena requested all related “engagement
    agreements or contracts” “[w]ithout regard to time”; “[a]ll
    underlying, supporting, or source documents and records . . . or
    any summaries of such documents”; and all related
    “memoranda, notes, and communications,” including
    “communications related to potential concerns that . . .
    information . . . provided by Donald J. Trump or . . . the Trump
    Organization[] [was] incomplete, inaccurate, or otherwise
    unsatisfactory.” 
    Id. Narrowed somewhat
    from the Chairman’s
    initial request to Mazars, the subpoena sought documents from
    “calendar years 2011 through 2018” “[u]nless otherwise
    noted.” 
    Id. The subpoena
    instructed Mazars to comply by
    April 29.
    Before that date arrived, however, President Trump and
    several of his business entities (collectively, the “Trump
    Plaintiffs”) filed this lawsuit seeking a declaratory judgment
    invalidating the subpoena and a permanent injunction
    prohibiting its enforcement. See Complaint at 13, Trump v.
    Committee on Oversight & Reform of U.S. House of
    Representatives, 
    380 F. Supp. 3d 76
    (D.D.C. 2019) (No.
    19-cv-01136) (“Complaint”). The Trump Plaintiffs also moved
    for a preliminary injunction, and while that motion was
    pending, the Committee agreed to defer Mazars’s deadline to
    comply with the subpoena.
    The district court worked quickly to provide the parties
    with an answer. Following the Supreme Court’s direction to
    “give[] the most expeditious treatment” to suits seeking to
    enjoin congressional subpoenas, Eastland v. U.S. Servicemen’s
    Fund, 
    421 U.S. 491
    , 511 n.17 (1975), the court “consolidate[d]
    [its] hearing on the preliminary injunction” with a resolution of
    the merits by “treat[ing] the parties’ briefing”—which raised
    10
    no disputes of material fact—“as cross-motions for summary
    judgment,” 
    Trump, 380 F. Supp. 3d at 88
    , 90; see also Fed. R.
    Civ. P. 65(a)(2) (permitting the court, “[b]efore or after
    beginning the hearing on a motion for a preliminary
    injunction,” to “advance the trial on the merits and consolidate
    it with the hearing”). Then, after explaining that its “analysis
    must be highly deferential to the legislative branch,” 
    Trump, 380 F. Supp. 3d at 91
    , the court concluded that each of the four
    investigative topics set forth in Chairman Cummings’s
    April 12 memorandum represents “a subject ‘on which
    legislation could be had,’” 
    id. at 94
    (quoting McGrain v.
    Daugherty, 
    273 U.S. 135
    , 177 (1927)). The court thus granted
    summary judgment in favor of the Oversight Committee. See
    
    id. at 105.
    The Trump Plaintiffs now appeal, challenging the district
    court’s grant of summary judgment to the Committee (though
    not its decision to treat the briefs as cross-motions for summary
    judgment). By agreement of the parties, Mazars need not
    comply with the subpoena during the pendency of this
    expedited appeal. See Oral Arg. Tr. 129. After oral argument,
    and at the court’s invitation, the Department of Justice filed an
    amicus brief, and the Trump Plaintiffs and Committee
    responded. Our review is de novo. See Teva Pharmaceuticals
    USA, Inc. v. Food & Drug Administration, 
    441 F.3d 1
    , 3 (D.C.
    Cir. 2006) (reviewing de novo “the district court’s legal
    determination” made after “consolidat[ing] [a] motion for a
    preliminary injunction with a final decision on the merits”).
    11
    II.
    This is hardly the first subpoena Congress has issued—
    legislative subpoenas are older than our country itself—and the
    parties draw upon the historical record to support their claims.
    Accordingly, before digging into the details of this case, we
    think it necessary to place the challenged subpoena in historical
    context.
    The story of legislative subpoenas extends all the way back
    to the “emergence of [the English] Parliament,” when that
    body, as part of its campaign to “challenge the absolute power
    of the monarch,” asserted “plenary authority” to hold offending
    parties in contempt. Watkins v. United States, 
    354 U.S. 178
    ,
    188 (1957). Beginning in the late seventeenth century,
    Parliament armed “a host of committees” with the “powers to
    send for persons and papers” in aid of their
    “investigat[ions] . . . [into] the operations of government”—
    from “the conduct of the war in Ireland” to “[t]he unwarranted
    proclamation of martial law . . . by a commissioner of the East
    India Company” to “the State of the Gaols of [the] Kingdom.”
    James M. Landis, Constitutional Limitations on the
    Congressional Power of Investigation, 40 Harv. L. Rev. 153,
    162–63 (1926). Across the Atlantic, too, “[t]he privileges and
    powers of the [House of] Commons were naturally assumed to
    be an incident of the representative assemblies of the Thirteen
    Colonies.” 
    Id. at 165.
    After the Revolutionary War and the Constitutional
    Convention, the U.S. Congress wasted little time in asserting
    its power to use compulsory process to investigate matters of
    national—and potentially legislative—importance. The House
    of Representatives opened the first such investigation in 1792,
    when it passed a resolution appointing a committee “to inquire
    into the causes of the failure of the late expedition under Major
    General St. Clair,” whose troops had recently suffered an
    12
    embarrassing defeat in the Northwest Territory, and
    “empowered” that committee “to call for such persons, papers,
    and records, as may be necessary to assist [its] inquiries.”
    3 Annals of Congress 493 (1792); see also George C. Chalou,
    General St. Clair’s Defeat, 1792–93, in 1 Congress
    Investigates: A Critical and Documentary History 1, 2 (Roger
    A. Bruns et al. eds., rev. ed. 2011). More investigatory
    committees, similarly empowered to issue subpoenas,
    followed. For example, in 1814, the House directed an inquiry
    “into the causes of the success of the enemy”—that is, the
    British—“in his late enterprises” in burning the Capitol, 28
    Annals of Congress 310 (1814), and, in 1859, the Senate
    established a select committee to “inquire into the facts
    attending” John Brown’s raid on Harpers Ferry and to “report
    whether . . . and what legislation may . . . be necessary . . . for
    the future preservation of the peace,” Cong. Globe, 36th Cong.,
    1st Sess. 141 (1859).
    But not until 1880 did “the first case reach[] [the Supreme]
    Court to challenge the use of compulsory process as a
    legislative device.” 
    Watkins, 354 U.S. at 193
    . In that case,
    Kilbourn v. Thompson, 
    103 U.S. 168
    (1881), the Court held
    that the House had exceeded its investigatory authority by
    opening an inquiry into the bankruptcy proceedings of a firm
    into which the United States had invested money. The Court
    explained that Congress’s sole route to a remedy in that
    bankruptcy proceeding, like that of all other dissatisfied
    creditors, was “by a resort to a court of justice.” 
    Id. at 193.
    Accordingly, because under those circumstances the House’s
    investigation “could result in no valid legislation,” 
    id. at 195,
    the Court concluded that the House had impermissibly
    “assumed a power which could only be properly exercised by
    another branch of the government,” 
    id. at 192.
                                   13
    If Kilbourn created any doubt about Congress’s power to
    conduct legislative investigations, the Supreme Court dispelled
    that cloud in a pair of cases arising out of alleged corruption in
    the administration of President Warren G. Harding. In the first,
    McGrain v. Daugherty, the Court considered a subpoena issued
    to the brother of then-Attorney General Harry Daugherty for
    bank records relevant to the Senate’s investigation into the
    Department of Justice. Concluding that the subpoena was valid,
    the Court explained that Congress’s “power of inquiry . . . is an
    essential and appropriate auxiliary to the legislative function,”
    as “[a] legislative body cannot legislate wisely or effectively in
    the absence of information respecting the conditions which the
    legislation is intended to affect or 
    change.” 273 U.S. at 174
    –
    75. It mattered not that the Senate’s authorizing resolution
    lacked an “avow[al] that legislative action was had in view”
    because, said the Court, “the subject to be investigated was . . .
    [p]lainly [a] subject . . . on which legislation could be had” and
    such legislation “would be materially aided by the information
    which the investigation was calculated to elicit.” 
    Id. at 176–77
    (internal quotation marks omitted). That was enough. Although
    “[a]n express avowal” of the Senate’s legislative objective
    “would have been better,” the Court admonished that “the
    presumption should be indulged that [legislation] was the real
    object.” 
    Id. at 178.
    Two years later, in Sinclair v. United States, 
    279 U.S. 263
    (1929), the Court echoed many of the same refrains. In this
    second case, Harry Sinclair, the president of an oil company,
    appealed his conviction for refusing to answer a Senate
    committee’s questions regarding his company’s allegedly
    fraudulent lease on federal oil reserves at Teapot Dome in
    Wyoming. The Court, acknowledging individuals’ “right to be
    exempt from all unauthorized, arbitrary or unreasonable
    inquiries and disclosures in respect of their personal and private
    affairs,” 
    id. at 292,
    nonetheless explained that because “[i]t was
    14
    a matter of concern to the United States,” “the transaction
    purporting to lease to [Sinclair’s company] the lands within the
    reserve cannot be said to be merely or principally . . . personal,”
    
    id. at 294.
    The Court also dismissed the suggestion that the
    Senate was impermissibly conducting a criminal investigation.
    “It may be conceded that Congress is without authority to
    compel disclosures for the purpose of aiding the prosecution of
    pending suits,” explained the Court, “but the authority of that
    body, directly or through its committees, to require pertinent
    disclosures in aid of its own constitutional power is not
    abridged because the information sought to be elicited may also
    be of use in such suits.” 
    Id. at 295.
    The Court returned to the question of Congress’s
    investigative authority during the Cold War, as “investigations
    into the threat of subversion of the United States Government”
    began to raise “novel questions [about] the appropriate limits
    of congressional inquiry” “into the lives and affairs of private
    citizens.” 
    Watkins, 354 U.S. at 195
    . At first, the Court avoided
    these thorny First Amendment issues by resolving cases on
    other grounds. In United States v. Rumely, the Court overturned
    a defendant’s contempt-of-Congress conviction for refusing to
    answer a congressional committee’s request for “the names of
    those who made bulk purchases” of “books of a particular
    political tendentiousness.” 
    345 U.S. 41
    , 42 (1953). Rather than
    reach the “[g]rave” First Amendment question posed by such
    an inquiry, the Court interpreted the House’s authorizing
    resolution, which instructed the committee to study “lobbying
    activities,” as failing to permit an investigation into the sale of
    books. 
    Id. at 45,
    48. And a few years later, in Watkins v. United
    States, the Court overturned another contempt conviction, this
    time holding that the defendant, a labor organizer who had
    refused “to testify about persons who may in the past have been
    Communist Party 
    members,” 354 U.S. at 185
    , had received
    insufficient notice of “the ‘question under inquiry’” at his
    15
    congressional hearing, 
    id. at 214
    (quoting 2 U.S.C. § 192). In
    that case, the Court took the opportunity to emphasize that
    although “there is no congressional power to expose for the
    sake of exposure,” courts should avoid “testing the motives of
    committee members for this purpose.” 
    Id. at 200.
    Rather, the
    crucial inquiry is whether a “legislative purpose is being
    served.” 
    Id. The Court
    soon reached the First Amendment issue it had
    been avoiding. In Barenblatt v. United States, the Court
    considered the case of a teacher convicted of criminal contempt
    for refusing, when testifying before a Subcommittee of the
    House Committee on Un-American Activities, to answer
    questions about his “past or present membership in the
    Communist Party.” 
    360 U.S. 109
    , 126 (1959). Unlike the
    Watkins defendant, the Barenblatt defendant had been
    “sufficiently apprised of the topic under inquiry” by “other
    sources of . . . information,” such as the Subcommittee
    “Chairman’s statement as to why he had been called” to testify
    and the questions posed by the Subcommittee to previous
    witnesses. 
    Id. at 124–25
    (internal quotation marks omitted).
    Proceeding, then, to the “precise constitutional issue”—
    namely, “whether the Subcommittee’s inquiry . . . transgressed
    the provisions of the First Amendment”—the Court explained
    that although “Congress may not constitutionally require an
    individual to disclose his . . . private affairs except in relation
    to” “a valid legislative purpose,” such a purpose was present in
    that case. 
    Id. at 127.
    Congress’s “wide power to legislate in the
    field of Communist activity . . . and to conduct appropriate
    investigations in aid thereof[] is hardly debatable,” said the
    Court, and “[s]o long as Congress acts in pursuance of its
    constitutional power, the Judiciary lacks authority to intervene
    on the basis of the motives which spurred the exercise of that
    power.” 
    Id. at 127,
    132. Thus, given “the governmental
    interests . . . at stake,” the Court concluded that “the First
    16
    Amendment [had] not been offended” and affirmed the
    defendant’s conviction. 
    Id. at 13
    4.
    Presidents, too, have often been the subjects of Congress’s
    legislative investigations, though fewer of these have required
    judicial intervention. Historical examples stretch far back in
    time and broadly across subject matters. In 1832, for example,
    the House vested a select committee with subpoena power “to
    inquire whether an attempt was made by the late Secretary of
    War . . . [to] fraudulently [award] . . . a contract for supplying
    rations” to Native Americans and to “further . . . inquire
    whether the President . . . had any knowledge of such attempted
    fraud, and whether he disapproved or approved of the same.”
    H.R. Rep. No. 22-502, at 1 (1832) (internal quotation marks
    omitted). Shortly after World War II, Congress’s Pearl Harbor
    Committee published a joint report exonerating the President
    of “charges” that he had “tricked, provoked, incited, cajoled, or
    coerced Japan into attacking this Nation.” S. Doc. No. 79-244,
    at xiii, 251 (1946). In 1987, the House established a committee
    to investigate the Iran-Contra Affair, including “the role of the
    President.” H.R. Rep. No. 100-433, at 21 (1987). During that
    investigation, President Reagan declined to assert executive
    privilege, going so far as to furnish “relevant excerpts of his
    personal diaries” to Congress. Morton Rosenberg,
    Congressional Research Service, RL 30319, Presidential
    Claims of Executive Privilege: History, Law, Practice and
    Recent Developments 14 (Aug. 21, 2008) (internal quotation
    marks omitted). And in the 1990s, first the House and Senate
    Banking Committees and then a Senate special committee
    investigated President and Mrs. Clinton’s involvement in the
    Whitewater land deal and related matters. See Douglas L.
    Kriner & Eric Schickler, Investigating the President 56–62
    (2016) (describing the “three-year congressional investigation
    of Whitewater”); see also S. Res. 120, 104th Cong. (1995)
    (establishing the Senate Special Committee to Investigate
    17
    Whitewater Development Corporation and Related Matters).
    Thanks to a last-minute compromise between the White House
    and the Senate, the courts were kept out of a dispute over
    whether the special committee could subpoena meeting notes
    taken by President Clinton’s former lawyer. See Louis Fisher,
    Congressional Research Service, RL 31836, Congressional
    Investigations: Subpoenas and Contempt Power 16–18
    (Apr. 2, 2003).
    Of all the historical examples, perhaps the most high-
    profile congressional investigation into a President—and the
    only one we have found that produced an appellate-level
    judicial opinion—was Congress’s investigation into President
    Nixon. The Senate created the Senate Select Committee on
    Presidential Campaign Activities, better known as the Senate
    Watergate Committee, to investigate “illegal, improper, or
    unethical activities engaged in by any persons” involved in a
    campaign “conducted by . . . any person seeking nomination or
    election . . . for the office of the President of the United States”
    during the “Presidential election of 1972.” S. Res. 60, 119
    Cong. Rec. 3255, 93rd Cong. § 1(a) (1973) (emphasis added).
    In Senate Select Committee on Presidential Campaign
    Activities v. Nixon, our court was asked to decide whether
    President Nixon had “a legal duty to comply with” a subpoena
    issued by the Senate Watergate Committee for “taped
    recordings of five conversations . . . discussing alleged
    criminal acts.” 
    498 F.2d 725
    , 726–27 (D.C. Cir. 1974) (en
    banc). President Nixon, apparently taking no issue with the
    general power of congressional committees to subpoena sitting
    Presidents, instead asserted executive privilege over the
    individual tapes requested, arguing that they “[could] []not be
    made public consistent with the confidentiality essential to the
    functioning of the Office of the President.” 
    Id. at 727
    (internal
    quotation marks omitted). In the end, we agreed with the
    President: although the “presumptive[] privilege[]” protecting
    18
    “presidential conversations” could “be overcome . . . by an
    appropriate showing of public need,” 
    id. at 7
    30 (internal
    quotation marks omitted), we explained, the Committee had
    failed to make such a showing “in the peculiar circumstances
    of [that] case,” 
    id. at 7
    33. But even though the Senate
    Watergate Committee ultimately lost, Senate Select Committee
    strongly implies that Presidents enjoy no blanket immunity
    from congressional subpoenas. After all, if such immunity
    exists, it would have been wholly unnecessary for the court to
    explore the subpoena’s particulars and to weigh “the public
    interest [in] favor[] [of] confidentiality” against a “showing of
    need by another institution of government”—that is, Congress.
    
    Id. at 730.
    All told, from Congress’s centuries-long experience
    issuing legislative subpoenas, and the courts’ (somewhat less
    frequent) experience reviewing them, a few principles
    emerge—principles that control our resolution of this case.
    As an initial matter, “whether [a] committee [is]
    authorized [to] exact the information” it has subpoenaed “must
    first be settled before . . . consider[ing] whether Congress had
    the [constitutional] power to confer upon the committee the
    authority which it claim[s].” 
    Rumely, 345 U.S. at 42
    –43. In
    other words, it matters not whether the Constitution would give
    Congress authority to issue a subpoena if Congress has given
    the issuing committee no such authority.
    That said, once a committee has been delegated “[t]he
    power of the Congress to conduct investigations,” that
    constitutional authority “is broad.” 
    Watkins, 354 U.S. at 187
    ;
    accord 
    Eastland, 421 U.S. at 504
    n.15 (“[T]he power to
    investigate is necessarily broad.”); 
    Barenblatt, 360 U.S. at 111
    (describing Congress’s investigative power as “broad”);
    Quinn v. United States, 
    349 U.S. 155
    , 160 (1955) (same);
    19
    
    McGrain, 273 U.S. at 173
    –74 (same). “It encompasses
    inquiries concerning the administration of existing laws as well
    as proposed or possibly needed statutes,” “[i]t includes surveys
    of defects in our social, economic or political system for the
    purpose of enabling the Congress to remedy them,” and “[i]t
    comprehends probes into departments of the Federal
    Government to expose corruption, inefficiency or waste.”
    
    Watkins, 354 U.S. at 187
    . In short, “[a] legislative inquiry may
    be as broad, as searching, and as exhaustive as is necessary to
    make effective the constitutional powers of Congress.”
    Townsend v. United States, 
    95 F.2d 352
    , 361 (D.C. Cir. 1938).
    Expansive as it is, however, Congress’s subpoena power is
    subject to several key constraints.
    First, because “the power of Congress . . . to investigate”
    is “co-extensive with [its] power to legislate,” 
    Quinn, 349 U.S. at 160
    , Congress may in exercising its investigative power
    neither usurp the other branches’ constitutionally designated
    functions nor violate individuals’ constitutionally protected
    rights. Congress may not conduct itself as “a law enforcement
    or trial agency,” as “[t]hese are functions of the executive and
    judicial departments.” 
    Watkins, 354 U.S. at 187
    . And Congress
    lacks any “general power to expose where the predominant
    result can only be an invasion of the private rights of
    individuals.” 
    Id. at 200.
    Next, precisely because “[t]he scope of [Congress’s]
    power of inquiry . . . is as penetrating and far-reaching as the
    potential power to enact and appropriate under the
    Constitution,” 
    Barenblatt, 360 U.S. at 111
    , Congress may
    investigate only those topics on which it could legislate, see
    
    Quinn, 349 U.S. at 161
    (stating that Congress’s “power to
    investigate” does not “extend to an area in which Congress is
    forbidden to legislate”). If no constitutional statute may be
    20
    enacted on a subject matter, then that subject is off-limits to
    congressional investigators.
    And finally, congressional committees may subpoena only
    information “calculated to” “materially aid[]” their
    investigations. 
    McGrain, 273 U.S. at 177
    . Even a valid
    legislative purpose cannot justify a subpoena demanding
    irrelevant material.
    With these principles in mind, we proceed to the
    particulars of this case. The Trump Plaintiffs dispute both the
    Committee’s authority from the House to issue the subpoena
    and the House’s authority under the Constitution to confer the
    same. For reasons that shall become clear later, we address
    these questions in reverse order.
    III.
    At the outset, we emphasize that to resolve this case we
    need not decide whether the Constitution permits Congress, in
    the conduct of a legislative—that is, non-impeachment—
    investigation, to issue subpoenas to a sitting President. That
    issue is not presented here because, quite simply, the Oversight
    Committee has not subpoenaed President Trump. Rather, the
    Committee has issued its subpoena to Mazars, an accounting
    firm with whom President Trump has voluntarily shared
    records from his time as a private citizen, as a candidate, and
    as President. Neither the Trump Plaintiffs nor the Department
    of Justice argues that the Constitution denies Congress
    authority to subpoena non-governmental custodians of the
    President’s financial information. Cf. Oral Arg. Tr. 50 (stating
    that assuming a committee has authority from the House to
    issue a subpoena, the relevant inquiry is whether “the subpoena
    ha[s] a legitimate legislative purpose”); 
    id. at 68
    (denying that
    the President is “absolutely immune from any oversight
    whatsoever”); Department Br. 7–8. Nor do the Trump Plaintiffs
    21
    assert any property rights in, or executive or other recognized
    evidentiary privilege over, the subpoenaed information. See
    Complaint (failing to assert any claim of privilege or property
    right in the subpoenaed materials); Oral Arg. Tr. 15
    (confirming that the President asserts no claim of executive
    privilege or immunity); see also Couch v. United States, 
    409 U.S. 322
    , 335 (1973) (recognizing that “no confidential
    accountant-client privilege exists under federal law, and no
    state-created privilege has been recognized in federal cases”);
    Peerenboom v. Marvel Entertainment, LLC, 
    148 A.D.3d 531
    ,
    532 (N.Y. App. Div. 1st Dep’t 2017) (holding that “[t]here is
    no accountant-client privilege in [New York]”). Instead, the
    Trump Plaintiffs ask us to do what courts have done ever since
    Kilbourn: to determine “[w]hether the Committee’s subpoena
    . . . is ‘related to, and in furtherance of, a legitimate task of the
    Congress.’” Appellants’ Br. 5 (quoting 
    Watkins, 354 U.S. at 187
    ); see also Department Br. 10 (quoting same).
    Taking up that question, we consider whether the
    Oversight Committee is pursuing a legislative, as opposed to a
    law-enforcement, objective; whether the Committee is
    investigating a subject on which constitutional legislation
    “could be had,” 
    McGrain, 273 U.S. at 177
    ; and whether the
    challenged subpoena seeks information sufficiently relevant to
    the Committee’s legislative inquiry.
    A.
    While “[t]he power of the Congress to conduct
    investigations is inherent in the legislative process,” 
    Watkins, 354 U.S. at 187
    , that authority “must not be confused with any
    of the powers of law enforcement,” which “are assigned under
    our Constitution to the Executive and the Judiciary,” 
    Quinn, 349 U.S. at 161
    . The Trump Plaintiffs contend that the
    Committee has crossed this constitutional line, veering from
    permissible legislative investigation into impermissible law
    22
    enforcement. In assessing whether Congress has strayed
    outside its legislative lane, we face two analytical hurdles.
    First, the case law is quite stingy in describing what
    impermissible congressional law enforcement might look like
    in practice. The Supreme Court has framed its primary
    instruction on this point in the negative: the fact that an
    investigation might expose criminal conduct does not
    transform a legislative inquiry into a law-enforcement
    endeavor. As the Court explained in Sinclair, Congress’s
    “authority . . . to require pertinent disclosures in aid of its own
    constitutional power is not abridged” merely “because the
    information sought to be elicited may also be of use” in
    criminal 
    prosecutions. 279 U.S. at 295
    . “Nor [is] it a valid
    objection,” said the Court in McGrain, that an investigation
    “might possibly disclose crime or 
    wrongdoing.” 273 U.S. at 179
    –80. Indeed, thanks to the Court’s clarity on this matter, all
    parties here agree that “a permissible legislative investigation
    does not become impermissible merely because it might expose
    law violations.” Appellants’ Br. 33 (internal quotation marks
    omitted); see also Appellee’s Br. 44 (“The fact that the . . .
    underlying conduct might also be unlawful . . . does not
    invalidate the inquiry.”).
    Second, the Supreme Court has made plain that “in
    determining the legitimacy of a congressional act,” courts may
    “not look to the motives alleged to have prompted it.” 
    Eastland, 421 U.S. at 508
    ; see also 
    Watkins, 354 U.S. at 200
    (stating that
    “a solution to our problem is not to be found in testing the
    motives of committee members for [legislative] purpose”);
    
    Barenblatt, 360 U.S. at 132
    (“So long as Congress acts in
    pursuance of its constitutional power, the Judiciary lacks
    authority to intervene on the basis of the motives which spurred
    the exercise of that power.”). This is true both because “it is not
    for [the courts] to speculate as to the motivations that may have
    23
    prompted the decision of individual [committee] members,”
    Wilkinson v. United States, 
    365 U.S. 399
    , 412 (1961), and
    because, in any event, those “motives alone would not vitiate
    an investigation which had been instituted by a House of
    Congress if that assembly’s legislative purpose is being
    served,” 
    Watkins, 354 U.S. at 200
    . On this point, too, the parties
    agree. See Appellants’ Reply Br. 11 (“To determine whether a
    subpoena is pursuing [the] impermissible goal” of law
    enforcement, “courts . . . cannot delve into legislators’ hidden
    motives . . . .”); Appellee’s Br. 43 (“[C]ourts cannot examine
    Congress’s motives to determine the validity of a subpoena.”).
    Thus stranded between Charybdis and Scylla, we must
    determine whether Congress’s “legislative purpose is being
    served,” 
    Watkins, 354 U.S. at 200
    , without taking into account
    either whether the investigation will reveal, or whether the
    investigators are motivated to reveal, criminal conduct.
    According to the Committee, the way out of this dilemma is
    simple: just “‘presume Congress is acting in furtherance of its
    constitutional responsibility to legislate and . . . defer to
    congressional judgments about what Congress needs to carry
    out that purpose.’” Appellee’s Br. 46 (quoting Trump, 380 F.
    Supp. 3d at 82). In most cases, such a presumption would be
    entirely appropriate. As the Court instructed in Tenney v.
    Brandhove, “[t]o find that a committee’s investigation has
    exceeded the bounds of legislative power it must be obvious
    that there was a usurpation of functions exclusively vested in
    the Judiciary or the Executive,” 
    341 U.S. 367
    , 378 (1951)
    (emphasis added); or, as it said in McGrain, even absent an
    “express avowal” by Congress that the purpose of an
    “investigation was to aid it in legislating,” “the presumption
    should be indulged that this was the real 
    object,” 273 U.S. at 178
    .
    24
    The trouble, however, is that this deferential presumption
    finds its roots in the principle that “every reasonable
    indulgence of legality must be accorded to the actions of a
    coordinate branch of our Government,” 
    Watkins, 354 U.S. at 204
    , and here, we arguably confront not one but two
    “coordinate branch[es] of our Government”—Congress and
    the President. We say “arguably” because it is far from obvious
    that President Trump, proceeding in his individual capacity,
    carries the mantle of the Office of the President in this case.
    The challenged subpoena seeks financial records totally
    unrelated to any of the President’s official actions; indeed, for
    six of the eight years covered by the subpoena, President
    Trump was merely Mr. Trump or Candidate Trump. Cf.
    Clinton v. Jones, 
    520 U.S. 681
    , 697 (1997) (“[W]e have never
    suggested that the President . . . has an immunity that extends
    beyond the scope of any action taken in an official capacity.”).
    That said, the fact remains that the constitutional authority
    assigned to the Office of the President can be exercised only by
    the flesh-and-blood human occupying that office, so as a
    practical matter, a restriction on the person might constrain the
    branch of government. Cf. In re Lindsey, 
    158 F.3d 1263
    , 1286
    (D.C. Cir. 1998) (“Because the Presidency is tied so tightly to
    the persona of its occupant[,] . . . official matters . . . often have
    personal implications for a President” and vice versa.) (Tatel,
    J., concurring in part and dissenting in part). In short, although
    the challenged subpoena, which seeks financial documents
    related to President Trump in his pre-presidential, private
    capacities, presents no direct inter-branch dispute, separation-
    of-powers concerns still linger in the air. Cf. United States v.
    Nixon, 
    418 U.S. 683
    , 702 (1974) (explaining that where a
    pretrial “subpoena is directed to a President of the United
    States, appellate review, in deference to a coordinate branch of
    Government, should be particularly meticulous”).
    25
    Assuming for the moment that we owe Congress no
    deference, we must figure out how to assess whether the
    subpoena serves “a valid legislative purpose,” 
    Barenblatt, 360 U.S. at 127
    , without resorting to the “presumption” “that
    [legislation] was the real object” of Congress’s investigation,
    
    McGrain, 273 U.S. at 178
    . The Trump Plaintiffs, arguing that
    “‘purpose’ and ‘motive’” are different, suggest that we may
    rely upon “available evidence”—that is, “what [the
    Committee] is doing and what it has stated publicly”—to
    “discern for [ourselves] what the Committee’s actual purpose
    is.” Appellants’ Br. 29–30. Following that course, we conclude
    that the public record reveals legitimate legislative pursuits, not
    an impermissible law-enforcement purpose, behind the
    Committee’s subpoena. As a result, we need not decide
    precisely what deference we owe Congress, as we would reach
    the same conclusion absent any deference at all.
    We start with Chairman Cummings’s April 12
    memorandum, in which he laid out the “need for [the]
    subpoena” issued to Mazars. Cummings Memo 1. As the
    document most closely tied in time and subject matter to the
    subpoena, that memorandum offers a natural starting point for
    our analysis. Cf. Shelton v. United States, 
    404 F.2d 1292
    , 1297
    (D.C. Cir. 1968) (identifying “the opening statement of the
    Chairman at [committee] hearings” and the “statements of the
    members of the committee” as “‘sources [that might] indicate
    the existence of a legislative purpose’” (quoting 
    Wilkinson, 365 U.S. at 410
    )). The Trump Plaintiffs and the Committee appear
    to agree, as does the dissent. See Appellee’s Br. 30–31 (relying
    on Chairman Cummings’s memorandum to supply a list of the
    subjects of the Committee’s investigations); Appellants’ Reply
    Br. 20–21 (dismissing as “retroactive rationalizations”
    potential legislative purposes that did not “appear[] in the
    Chairman’s memorandum” (alterations and internal quotation
    26
    marks omitted)); Dissenting Op. at 2 (tracing the “reasons” for
    the subpoena to Chairman Cummings’s Memo).
    Chairman Cummings’s memorandum identifies four
    questions that the subpoena will help answer: “whether the
    President may have engaged in illegal conduct before and
    during his tenure in office,” “whether [the President] has
    undisclosed conflicts of interest that may impair his ability to
    make impartial policy decisions,” “whether [the President] is
    complying with the Emoluments Clauses of the Constitution,”
    and “whether [the President] has accurately reported his
    finances to the Office of Government Ethics and other federal
    entities.” Cummings Memo 4. But even more important than
    this list, the Chairman’s very next sentence explains that “[t]he
    Committee’s interest in these matters informs [the
    Committee’s] review of multiple laws and legislative proposals
    under [its] jurisdiction.” 
    Id. Such an
    “express avowal of the
    [Committee’s] object” offers strong evidence of the
    Committee’s legislative purpose. 
    McGrain, 273 U.S. at 178
    .
    The April memorandum does not stand alone. Just two
    months earlier, Chairman Cummings articulated the same
    remedial legislative objective in his letter to White House
    Counsel. In that letter, he explained that obtaining the
    requested financial documents would “help the Committee
    determine why the President failed to report . . . payments and
    whether reforms are necessary to address deficiencies with
    current laws, rules, and regulations.” Cummings Feb. 15 Letter
    9. “Since the earliest days of our republic,” the Chairman
    emphasized, “Congress has investigated how existing laws are
    being implemented and whether changes to the laws are
    necessary.” 
    Id. And “[f]or
    decades,” he concluded, “this has
    included laws relating to financial disclosures required of the
    President.” 
    Id. 27 What’s
    more, although the House is under no obligation to
    enact legislation after every investigation, the fact that the
    House has pending several pieces of legislation related to the
    Committee’s inquiry offers highly probative evidence of the
    Committee’s legislative purpose. See In re Chapman, 
    166 U.S. 661
    , 670 (1897) (“[I]t is certainly not necessary” to identify
    future legislation “in advance.”); see also 
    Eastland, 421 U.S. at 509
    (“The very nature of the investigative function—like any
    research—is that it takes the searchers up some ‘blind alleys’
    and into nonproductive enterprises.”). The House has already
    passed one such bill, H.R. 1, which requires Presidents to list
    on their financial disclosures the liabilities and assets of any
    “corporation, company, firm, partnership, or other business
    enterprise in which” they or their immediate family have “a
    significant financial interest.” H.R. 1, 116th Cong. § 8012
    (2019). Another bill currently pending, H.R. 706, would
    require both sitting Presidents and presidential candidates to
    “submit to the Federal Election Commission a copy of the
    individual’s income tax returns” for the preceding nine or ten
    years, respectively. H.R. 706, 116th Cong. § 222 (2019). And
    still another, H.R. 745, would amend the Ethics in Government
    Act to make the Director of the Office of Government Ethics
    removable only for cause. See H.R. 745, 116th Cong. § 3
    (2019) (making the Director “subject to removal only for
    inefficiency, neglect of duty, or malfeasance in office”).
    Despite these indicia of legislative purpose, the Trump
    Plaintiffs contend that “[t]he subpoena’s actual purpose is law
    enforcement.” Appellants’ Reply Br. 9 (emphasis added). They
    make four principal arguments.
    First, the Trump Plaintiffs question whether the
    Committee’s avowals of legislative purpose are genuine.
    Quoting our court’s opinion in Shelton v. United States, they
    argue that “Congress cannot cure [a] constitutional violation
    28
    through ‘the mere assertion of a need to consider remedial
    legislation.’” Appellants’ Br. 34 (quoting 
    Shelton, 404 F.2d at 1297
    ). But the Trump Plaintiffs stop at a key conjunction.
    “[T]he mere assertion of a need to consider ‘remedial
    legislation’ may not alone justify an investigation,” we
    explained in 
    Shelton. 404 F.2d at 1297
    . “[B]ut,” we continued,
    “when the purpose asserted is supported by references to
    specific problems which in the past have been or which in the
    future could be the subjects of appropriate legislation, then we
    cannot say that a committee of the Congress exceeds its broad
    power.” 
    Id. (emphasis added).
    That is just this case. We do not confront an insubstantial,
    makeweight assertion of remedial purpose. To the contrary,
    Chairman Cummings’s April 12 memorandum to his
    colleagues lists four investigative topics; his March 20 letter to
    Mazars details several “specific concerns raised by the [firm’s]
    financial statements,” Cummings Mar. 20 Letter 2; and his
    February 15 letter to White House Counsel states his intent to
    assess whether “changes to the laws . . . relating to financial
    disclosures required of the President” “are necessary,”
    Cummings Feb. 15 Letter 9. These “references to specific
    problems,” 
    Shelton, 404 F.2d at 1297
    , together with actual
    legislation now pending, 
    see supra
    at 26–27, are more than
    sufficient to demonstrate the Committee’s interest in
    investigating possible remedial legislation.
    Second, the Trump Plaintiffs contend that, far from
    “avow[ing]” a legislative intent, 
    McGrain, 273 U.S. at 178
    ,
    Chairman Cummings’s memorandum and statements by other
    Representatives have “affirmatively and definitely avowed an
    unlawful law-enforcement purpose,” Appellants’ Reply Br. 13
    (internal quotation marks omitted); see also Dissenting Op. at
    43. In particular, the Trump Plaintiffs take issue with the first
    investigative rationale offered in Chairman Cummings’s
    29
    memorandum: “to investigate whether the President may have
    engaged in illegal conduct before and during his tenure in
    office.” Cummings Memo 4. But even if such an investigation
    would not by itself serve a legitimate legislative purpose, we
    can easily reject the suggestion that this rationale spoils the
    Committee’s otherwise valid legislative inquiry. Simply put, an
    interest in past illegality can be wholly consistent with an intent
    to enact remedial legislation.
    Take Hutcheson v. United States, in which the Court
    considered the activities of a Senate committee tasked with
    “investigat[ing] . . . the extent to which criminal . . . practices
    or activities” were occurring “in the field of labor-management
    relations” and “determin[ing] whether any changes [were]
    required in the laws . . . to protect . . . against . . . such practices
    or activities.” 
    369 U.S. 599
    , 600–01 (1962) (quoting S. Res. 74,
    85th Cong. (1957)). The president of the United Brotherhood
    of Carpenters and Joiners of America, called before the
    committee to testify regarding whether he had used “union
    funds . . . to ‘fix’ a 1957 criminal investigation . . . by a state
    grand jury,” 
    id. at 603,
    refused to answer such questions and
    was convicted of criminal contempt, see 
    id. at 605.
    Even
    though “[t]he Committee’s concern . . . was to discover
    whether . . . [union] funds . . . had been used . . . to bribe a state
    prosecutor,” and even though “[i]f these suspicions were
    founded, they might . . . have warranted a separate state
    prosecution for obstruction of justice,” the Supreme Court
    nonetheless affirmed the contempt conviction. 
    Id. at 617–18.
    What mattered to the Court was that the committee’s
    investigation into the details of the defendant’s illegal conduct
    “would have supported remedial federal legislation for the
    future.” 
    Id. at 617.
    “[S]urely,” the Court concluded, “a
    congressional committee . . . engaged in a legitimate legislative
    investigation need not grind to a halt whenever . . . crime or
    30
    wrongdoing is disclosed.” 
    Id. at 618
    (internal citations
    omitted).
    Sinclair teaches a similar lesson. Shortly before the Senate
    summoned the oil tycoon Sinclair to testify, it had passed a
    joint resolution “recit[ing] that [his company’s] leases . . . were
    executed under circumstances indicating fraud and corruption”
    and “direct[ing] the President . . . to prosecute such . . .
    proceedings, civil and criminal, as were warranted by the
    
    facts.” 279 U.S. at 289
    . When Sinclair appeared for the hearing,
    the Senate committee considered but rejected a motion that
    would have prohibited “inquir[ies] . . . relat[ing] to pending
    controversies before any of the Federal courts in which Mr.
    Sinclair [was] a defendant.” 
    Id. at 290.
    “If we do not examine
    Mr. Sinclair about those matters,” one committee member
    lamented, “there is not anything else to examine him about.”
    
    Id. Despite all
    this, the Court held that “[t]he record [did] not
    sustain [Sinclair’s] contention that the investigation was
    avowedly not in aid of legislation.” 
    Id. at 295.
    The failed
    motion and the member’s statement were “not enough to show
    that the committee intended to depart from the purpose to
    ascertain whether additional legislation might be advisable,”
    explained the Court, because “[i]t [was] plain that investigation
    of the matters involved in” pending or future “suits . . . might
    directly aid in respect of legislative action.” 
    Id. So too
    here. Like the committees in Hutcheson and
    Sinclair, the Oversight Committee has expressed an interest in
    determining whether and how illegal conduct has occurred. But
    also like the committees in Hutcheson and Sinclair—indeed,
    even more so—the Oversight Committee has repeatedly
    professed that it seeks to investigate remedial legislation. In
    fact, the House has even put its legislation where its mouth is:
    it has passed one bill pertaining to the information sought in
    the subpoenas and is considering several others. See supra at
    31
    26–27. The Committee’s interest in alleged misconduct,
    therefore, is in direct furtherance of its legislative purpose.
    Third, the Trump Plaintiffs argue that the subpoena’s
    “laser-focus[] on the businesses and finances of one person”
    evinces “a particularity that is the hallmark of executive and
    judicial power.” Appellants’ Br. 35. But again, Supreme Court
    precedent forecloses this contention. In McGrain, for example,
    the Senate authorized a select committee “to investigate . . . the
    alleged failure of Harry M. Daugherty, Attorney General of the
    United States, to prosecute properly violators of” anti-trust
    laws and “further directed [the committee] to inquire into,
    investigate and report . . . the activities of the said Harry M.
    Daugherty, Attorney General, and any of his assistants . . .
    which would in any manner tend to impair their efficiency or
    influence as representatives of the government of the United
    
    States.” 273 U.S. at 151
    –52 (internal quotation marks omitted).
    Untroubled by the resolution’s “direct reference to the then
    Attorney General by name,” the Court held that “the resolution
    and proceedings” of the investigatory committee “g[a]ve no
    warrant for thinking the Senate was attempting or intending to
    try the Attorney General . . . before its committee for any crime
    or wrongdoing.” 
    Id. at 179.
    The lesson of McGrain is that an investigation may
    properly focus on one individual if that individual’s conduct
    offers a valid point of departure for remedial legislation. Again,
    such is the case here. It is not at all suspicious that the
    Committee would focus an investigation into presidential
    financial disclosures on the accuracy and sufficiency of the
    sitting President’s filings. That the Committee began its inquiry
    at a logical starting point betrays no hidden law-enforcement
    purpose.
    Finally, the Trump Plaintiffs detect something untoward in
    32
    the Committee’s interest in the President’s finances. “If this
    subpoena is valid,” they argue, “then Congress is free to
    investigate every detail of a President’s personal life, with
    endless subpoenas to his accountants, bankers, lawyers,
    doctors, family, friends, and anyone else with information that
    a committee finds interesting.” Appellants’ Reply Br. 24.
    But unlike a subpoena to, say, a doctor or an attorney, the
    congressional request at issue in this case implicates no
    material subject to a recognized legal privilege or an asserted
    property interest. See supra at 20. Moreover, as the Court
    explained in Sinclair, although Congress may not make
    “unauthorized, arbitrary or unreasonable inquiries” into
    individuals’ “personal and private affairs,” Congress most
    assuredly does possess authority “to require pertinent
    disclosures in aid of its . . . constitutional power” when those
    affairs become a “matter of [public] concern” amenable to a
    legislative 
    solution. 279 U.S. at 292
    , 294–95; see also
    
    Barenblatt, 360 U.S. at 127
    (explaining that “Congress
    may . . . constitutionally require an individual to disclose his
    political relationships or other private affairs” if “in relation to”
    “a valid legislative purpose”). The same rationale applies here.
    Whether current financial disclosure laws are successfully
    eliciting the right information from the sitting President,
    occupant of the highest elected office in the land, is
    undoubtedly “a matter of concern to the United States.”
    
    Sinclair, 279 U.S. at 294
    ; cf. Washington Post Co. v. U.S.
    Department of Health & Human Services, 
    690 F.2d 252
    , 265
    (D.C. Cir. 1982) (“[T]he [Ethics in Government] Act shows
    Congress’ general belief that public disclosure of conflicts of
    interest is desirable despite its cost in loss of personal
    privacy.”).
    In its amicus brief, the Justice Department argues that the
    subpoena is invalid for still another reason, namely that the
    33
    House (or at least the Committee) failed to offer a “clear,
    specific statement . . . of the legislative purpose that it believes
    justifies its subpoena.” Department Br. 12 (emphasis added).
    In the Department’s view, general indicia of legislative purpose
    are not enough; the House must identify “with sufficient
    particularity the subject matter of potential legislation.” 
    Id. at 14.
    In support, the Department cites Watkins, where, it argues,
    “the Supreme Court demanded just such a clear statement of
    purpose.” 
    Id. at 13
    . But the Watkins Court demanded no such
    thing. That case concerned not the legitimacy of an
    investigative subpoena, but rather an appeal of a criminal
    conviction for contempt of Congress under 2 U.S.C. § 192,
    which makes it a misdemeanor to refuse to answer any question
    posed by a member of Congress “pertinent to the question
    under inquiry.” 
    Watkins, 354 U.S. at 207
    (quoting 2 U.S.C.
    § 192). Because the committee’s “authorizing resolution, the
    remarks of the chairman or members of the committee, [and]
    even the nature of the proceedings themselves,” 
    id. at 209,
    failed to articulate “the ‘question under inquiry,’” 
    id. at 214
    ,
    the Court reversed the conviction, holding that an individual
    risking criminal contempt must “have knowledge of the subject
    to which the interrogation is deemed pertinent . . . with the same
    degree of explicitness and clarity that the Due Process Clause
    requires in the expression of any element of a criminal
    offense.” 
    Id. at 208–09.
    The fact that the Watkins Court probed
    the committee’s statements in an attempt to remedy “the vice
    of vagueness”—present for criminal contempt of Congress, “as
    in all other crimes,” 
    id. at 209—provides
    no support for the
    Department’s contention that Congress must identify its
    legislative purpose “with sufficient particularity” in order to
    justify an investigative subpoena. See 
    Barenblatt, 360 U.S. at 123
    (explaining that in Watkins, the Court “rest[ed] [its]
    decision on [the] ground” that “a conviction for contempt
    under 2 U.S.C. § 192 cannot stand unless the questions asked
    are pertinent to the subject matter of the investigation”).
    34
    Far from finding support in Watkins, the Department’s
    argument conflicts with binding Supreme Court precedent.
    Over a century ago, the Court made clear in In re Chapman that
    it is “certainly not necessary that the resolutions should declare
    in advance what the [Congress] meditate[s] doing when the
    investigation [i]s 
    concluded.” 166 U.S. at 670
    . The Court has
    twice reiterated this holding, stating in McGrain that “it was
    not essential that the Senate declare in advance what it
    meditated 
    doing,” 273 U.S. at 172
    , and then in Eastland—
    issued nearly two decades after Watkins—that “to be a valid
    legislative inquiry there need be no predictable end 
    result,” 421 U.S. at 509
    . After all, the purpose of an investigation, as the
    Court explained in McGrain, is to gather “information
    respecting the conditions which the legislation is intended to
    affect or 
    change,” 273 U.S. at 174
    –75; it is, as the Court added
    in Eastland, “research” that informs future Congressional
    
    action, 421 U.S. at 509
    . Congress’s decision whether, and if so
    how, to legislate in a particular area will necessarily depend on
    what information it discovers in the course of an investigation,
    and its preferred path forward may shift as members educate
    themselves on the relevant facts and circumstances. Requiring
    Congress to state “with sufficient particularity” the legislation
    it is considering before it issues an investigative subpoena
    would turn the legislative process on its head.
    Moreover, it is not at all clear what such a statement would
    accomplish. The Department suggests that a clear statement
    rule is “mandate[d]” by the “particular separation-of-powers
    issues that arise when Congress attempts to compel the
    President to produce information.” Department Br. 9. Setting
    aside the fact that this subpoena, which is addressed to Mazars,
    “compel[s] the President to produce” nothing, we still see no
    justification in the Department’s brief for why specificity is
    required in this scenario as opposed to any other. To be sure,
    35
    “[t]he President occupies a unique position in the constitutional
    scheme.” Nixon v. Fitzgerald, 
    457 U.S. 731
    , 749 (1982). But
    that unique position has little bearing on our ability to
    determine whether Congress has strayed from the realm of
    legitimate legislation into improper law enforcement—an
    inquiry that, as we have just demonstrated, we can
    meaningfully conduct without the specific articulation the
    Department seeks. Nor does the Department explain how
    specificity would meaningfully protect the President beyond
    simply burdening Congress’s exercise of its own Article I
    power.
    The Department’s argument also ignores how much
    Congress has already revealed about its legislative objectives.
    In his February 15 letter and April 12 memorandum, Chairman
    Cummings explained that the Committee was reviewing
    “multiple laws and legislative proposals under [its]
    jurisdiction,” Cummings Memo 4, including whether “changes
    . . . are necessary” to “laws relating to financial disclosures
    required of the President,” Cummings Feb. 15 Letter 9. The
    House has already passed H.R. 1, which would require
    Presidents to disclose businesses in which they or their
    immediate families have significant interests, and is
    considering legislation which would require Presidential
    candidates and Presidents to submit their income tax returns to
    the Federal Election Commission and make the Director of the
    Office of Government Ethics removable only for cause. See
    supra at 26–27. To be sure, as the Department points out, the
    House passed H.R. 1 without the information the subpoena
    seeks. But House passage is far from the end of the legislative
    process. Information revealed by the subpoena could inform
    the Senate as it considers the bill, as well as any subsequent
    conference committee or the House itself, should it reconsider
    the bill post-conference.
    36
    Based on all the foregoing, we conclude that in issuing the
    challenged subpoena, the Committee was engaged in a
    “legitimate legislative investigation,” 
    Hutcheson, 369 U.S. at 618
    , rather than an impermissible law-enforcement inquiry.
    We next assess whether that legislative investigation concerned
    a subject “on which legislation could be had.” 
    McGrain, 273 U.S. at 177
    .
    B.
    Because “Congress may only investigate into those areas
    in which it may potentially legislate or appropriate,”
    
    Barenblatt, 360 U.S. at 111
    , a congressional committee may
    issue only those subpoenas that are “intended to gather
    information about a subject on which legislation may be had,”
    
    Eastland, 421 U.S. at 508
    ; see also 
    McGrain, 273 U.S. at 177
    (stating that “the subject” of investigation “was one on which
    legislation could be had”). The Trump Plaintiffs argue that the
    challenged subpoena fails this test because, in their view, “[t]he
    subpoena could not result in valid legislation regarding the
    President.” Appellants’ Reply Br. 17.
    In addressing this argument, we emphasize that the
    relevant inquiry is whether legislation “may be had,” 
    Eastland, 421 U.S. at 508
    (emphasis added), not whether constitutional
    legislation will be had. Accordingly, we first define the
    universe of possible legislation that the subpoena provides
    “information about,” 
    id., and then
    consider whether Congress
    could constitutionally enact any of those potential statutes.
    We must, however, tread carefully. As the Committee
    points out, our limited judicial role gives us no authority to
    reach out and “[s]trik[e] down a statute before it is even
    enacted.” Appellee’s Br. 41; see also Nashville, Chattanooga
    & St. Louis Railway v. Wallace, 
    288 U.S. 249
    , 262 (1933)
    (explaining that courts may not make “abstract
    37
    determination[s] . . . of the validity of a statute” or issue
    “decision[s] advising what the law would be on an uncertain or
    hypothetical state of facts”). That said, as the Trump Plaintiffs
    observe, see Appellants’ Br. 21 (“[b]ecause valid legislation
    could not ‘be had’ if it would be unconstitutional, the court
    ha[s] to decide whether this subpoena is designed to advance
    unconstitutional legislation”), the only way to determine
    whether the Committee’s investigation informs “a subject on
    which legislation may be had” is to ask, abstract as the inquiry
    may be, whether “legislation may be had” on that “subject,”
    
    Eastland, 421 U.S. at 508
    (emphasis added). Although we must
    avoid passing on the constitutionality of hypothetical statutes,
    we must also fulfill our responsibility to decide the case in front
    of us, even if the road to resolution passes through an issue of
    constitutional law. See Cohens v. Virginia, 
    19 U.S. 264
    , 404
    (1821) (“The judiciary cannot, as the legislature may, avoid a
    measure because it approaches the confines of the
    [C]onstitution. . . . [W]e must decide [a case] if it be brought
    before us.”). Accordingly, in order to resolve this case, we need
    to identify a statutory litmus test. The Committee and the
    Trump Plaintiffs each offer one, but neither quite fits our needs.
    The Committee urges us to consider whether any law
    “concerning government ethics and conflicts of interest
    affecting Executive Branch officials” could pass constitutional
    muster. Appellee’s Br. 30. But this test is too broad. The
    challenged subpoena—or, more specifically, the portion of the
    subpoena that seeks a sitting President’s financial
    information—would produce no relevant “information about,”
    
    id., laws that
    apply to ordinary Executive Branch employees.
    Because “[t]he President occupies a unique position in the
    constitutional scheme,” 
    Fitzgerald, 457 U.S. at 749
    ,
    Congress’s constitutional authority to regulate the President’s
    conduct is significantly more circumscribed than its power to
    regulate that of other federal employees, 
    see supra
    at 35–36.
    38
    Just as a congressional committee could not subpoena the
    President’s high school transcripts in service of an
    investigation into K-12 education, nor subpoena his medical
    records as part of an investigation into public health, it may not
    subpoena his financial information except to facilitate an
    investigation into presidential finances. Thus, to determine
    whether the records of pre-Candidate, Candidate, and President
    Trump provide “information about a subject on which
    legislation may be had,” 
    Eastland, 421 U.S. at 508
    , we must
    train our attention on laws that apply to Presidents (and
    presidential hopefuls).
    In that vein, the Trump Plaintiffs urge us to focus on the
    constitutionality of laws that “impose conflict-of-interest
    restrictions on the President.” Appellants’ Br. 37. As the Trump
    Plaintiffs point out, such restrictions raise difficult
    constitutional questions. Statutes mandating divestment from
    financial interests or recusal from conflicted matters might
    impermissibly “disempower [Presidents] from performing
    some of the functions prescribed [by] the Constitution or . . .
    establish a qualification for . . . serving as President . . . beyond
    those contained in the Constitution.” Memorandum from
    Laurence H. Silberman, Deputy Attorney General, to Richard
    T. Burress, Office of the President, Re: Conflict of Interest
    Problems Arising out of the President’s Nomination of Nelson
    A. Rockefeller to be Vice President Under the Twenty-Fifth
    Amendment to the Constitution 5 (Aug. 28, 1974) (“Silberman
    Memo”). But we need not grapple with those constitutional
    issues because the Mazars subpoena seeks information related
    to a class of statutes that impose far fewer burdens than laws
    requiring Presidents to change their behavior based on their
    financial holdings. This less burdensome species of law would
    require the President to do nothing more than disclose financial
    information. Such statutes might amend the Ethics in
    Government Act, for example, to require Presidents and
    39
    presidential candidates to file reports more frequently, to
    include information covering a longer period of time, or to
    provide new kinds of information such as past financial
    dealings with foreign businesses or current liabilities of closely
    held companies. We take this category of statutes as the
    appropriate object of our litmus test in this case.
    The Trump Plaintiffs argue that the Constitution prohibits
    even these. Relying on Chief Justice Burger’s concurrence in
    Nixon v. Fitzgerald, they contend that financial disclosure laws
    unconstitutionally “‘impinge[] on and hence interfere[] with
    the independence that is imperative to the functioning of the
    office of a President.’” Appellants’ Br. 44 (quoting 
    Fitzgerald, 457 U.S. at 761
    (Burger, C.J., concurring)).
    But that is not the rule—at least not quite. As the Court
    explained in Nixon v. Administrator of General Services (Nixon
    II), the mere act of “regulat[ing] . . . Presidential materials,”
    “without more,” does not “constitute[] . . . a violation of the
    principle of separation of powers.” 
    433 U.S. 425
    , 441 (1977).
    Instead, rejecting “the argument that the Constitution
    contemplates a complete division of authority between the
    three branches,” the Court reaffirmed its reliance on “the more
    pragmatic, flexible approach of Madison in the Federalist[]
    Papers.” 
    Id. at 442–43.
    “In . . . dividing and allocating the
    sovereign power among three coequal branches,” the Court
    explained, “the Framers of the Constitution” did not intend “the
    separate powers . . . to operate with absolute independence.”
    
    Id. at 443
    (internal quotation marks and emphasis omitted). The
    Court therefore announced the following test: “in determining
    whether [a statute] disrupts the proper balance between the
    coordinate branches, the proper inquiry focuses on the extent
    to which it prevents the Executive Branch from accomplishing
    its constitutionally assigned functions.” 
    Id. Applying this
    rule,
    we have no basis for concluding that complying with financial
    40
    disclosure laws would in any way “prevent[] the [President]
    from accomplishing [his] constitutionally assigned functions.”
    
    Id. The most
    persuasive evidence on this score comes from
    the Constitution itself. The very same document that “vest[s]”
    “[t]he executive Power . . . in [the] President,” U.S. Const.
    art. II, § 1, cl. 1, and directs him to “take Care that the Laws be
    faithfully executed,” 
    id. art. II,
    § 3, also imposes two separate
    requirements pertaining to the President’s private finances. The
    first, the so-called Domestic Emoluments Clause, prohibits the
    President from receiving “any . . . Emolument” from the
    federal or state governments other than a fixed
    “Compensation” “for his Services.” 
    Id. art. II,
    § 1, cl. 7. And
    the second, the so-called Foreign Emoluments Clause,
    prohibits any federal official “holding any Office of Profit or
    Trust”—the President included—from “accept[ing] . . . any
    present, Emolument, Office, or Title, of any kind whatever,
    from any King, Prince, or foreign State” without “the Consent
    of the Congress.” U.S. Const. art. I, § 9, cl. 8; see also
    Applicability of the Emoluments Clause & the Foreign Gifts &
    Decorations Act to the President’s Receipt of the Nobel Peace
    Prize, O.L.C. slip op. at 4, 
    2009 WL 6365082
    , at *4 (Dec. 7,
    2009) (“The President surely ‘hold[s] an[] Office of Profit or
    Trust’ . . . .” (alterations in original) (quoting U.S. Const. art. I,
    § 9, cl. 8)). If the President may accept no domestic
    emoluments and must seek Congress’s permission before
    accepting any foreign emoluments, then surely a statute
    facilitating the disclosure of such payments lies within
    constitutional limits.
    The United States Code, too, provides ample precedent for
    laws that regulate Presidents’ finances and records. Cf. Nixon
    
    II, 433 U.S. at 445
    (noting the “abundant statutory precedent
    for the regulation and mandatory disclosure of documents in
    41
    the possession of the Executive Branch”). The Foreign Gifts
    and Decorations Act requires all federal employees, including
    the President, to “file a statement” regarding any gift they
    receive “of more than minimal value.” 5 U.S.C. § 7342(c). The
    STOCK Act prohibits all “executive branch employees,”
    including the President, from “us[ing] nonpublic information
    derived from such person’s position . . . as a means for making
    a private profit.” Pub. L. No. 112-105, §§ 2, 9, 126 Stat. 291,
    291, 297. And the Presidential Records Act—whose
    constitutionality the Trump Plaintiffs readily concede—
    establishes a whole statutory scheme for “categoriz[ing],”
    “fil[ing],” “dispos[ing]” of, and “manag[ing]” “Presidential
    records.” 44 U.S.C. § 2203; see Appellants’ Br. 40 (“The
    Presidential Records Act . . . did not cause a disruption of
    executive functions significant enough to trigger separation of
    powers analysis” (internal quotation marks omitted)). History
    discloses no evidence that these statutes have disrupted
    presidential functions.
    The history of past Presidents’ financial disclosures offers
    a particularly useful guide. As explained above, 
    see supra
    at 3–
    4, the Ethics in Government Act requires Presidents to file
    periodic reports detailing, among other things, “[t]he source,
    type, and [approximate] amount or value of income . . . from
    any [non-federal] source,” “[t]he identity and [approximate]
    value of . . . total liabilities owed,” and “the date . . . and
    [approximate] value of any purchase, sale or exchange [of real
    property and securities] during the preceding calendar year.”
    5 U.S.C. app. 4 § 102(a). Every President to have served since
    the Ethics in Government Act became law in 1978—Presidents
    Carter, Reagan, H.W. Bush, Clinton, W. Bush, Obama, and
    now Trump—has complied with these disclosure requirements.
    See, e.g., Philip Taubman, Carter Drops ‘Blind Trust’ Secrecy
    and Divulges Finances for 1978-9, N.Y. Times, May 31, 1979,
    at A1; Edward T. Pound, Reagan’s Worth Put at $4 Million,
    42
    N.Y. Times, Feb. 23, 1981, at A1; Associated Press,
    President’s Trust Grows in Value, N.Y. Times, May 15, 1992,
    at A17; Stephen Labaton, Most of Clintons’ Wealth Held by
    Mrs. Clinton, Disclosure Form Shows, N.Y. Times, May 18,
    1994, at A20; Richard W. Stevenson, Bushes’ Assets Put at
    $8.8 Million in Filing, N.Y. Times, May 16, 2003, at A22; U.S.
    Office of Government Ethics, Presidential and Vice
    Presidential        Financial        Disclosure          Reports,
    https://extapps2.oge.gov/201/Presiden.nsf/President%20and%
    20Vice%20President%20Index (financial disclosure reports of
    Presidents Obama and Trump); see also Appellants’ Br. 44
    (acknowledging that “President [Trump] has voluntarily
    complied with those statutory requirements”). In fact,
    Presidents Carter, Reagan, H.W. Bush, Clinton, W. Bush, and
    Obama exceeded statutory disclosure requirements by
    releasing their personal federal income tax returns to the public.
    See       Presidential       Tax      Returns,         TaxNotes,
    taxnotes.com/presidential-tax-returns (collecting presidential
    tax records).
    Of course, as the Trump Plaintiffs point out, “compliance
    is not the measure of constitutionality.” Appellants’ Br. 44. But
    when asked to decide whether an act of Congress “disrupts the
    proper balance between the coordinate branches,” Nixon 
    II, 433 U.S. at 443
    , a court would be foolish to ignore those branches’
    prior pattern of conflict—or, as here, cooperation. See 
    id. at 441
    (finding it significant that “[n]either President Ford nor
    President Carter support[ed] [former-President Nixon’s]
    claim” that the challenged statute’s “regulation of the
    disposition of Presidential materials . . . constitutes, without
    more, a violation of the principle of separation of powers”); cf.
    Zivotofsky v. Kerry, 
    135 S. Ct. 2076
    , 2091 (2015) (“In
    separation-of-powers cases this Court has often ‘put significant
    weight upon historical practice.’” (quoting NLRB v. Noel
    Canning, 
    573 U.S. 513
    , 524 (2014))). Though not dispositive,
    43
    the fact that every President during the last four decades has
    filed financial disclosures offers persuasive evidence that such
    disclosures neither “prevent[]” nor “disrupt[],” Nixon 
    II, 433 U.S. at 443
    , the President’s efforts to “take Care that the Laws
    be faithfully executed,” U.S. Const. art. II, § 3.
    To be sure, it is possible that some hypothetical statute
    could go too far. One could certainly imagine disclosure
    mandates so onerous that they begin to “prevent[] the
    Executive Branch from accomplishing its constitutionally
    assigned functions.” Nixon 
    II, 433 U.S. at 443
    ; see, e.g., Oral
    Arg. Tr. 17 (positing “a statute [requiring] the President . . . to
    submit 100,000 pages of financial disclosures and [to] meet
    with Congress once a month to discuss them”). But to accept
    the Trump Plaintiffs’ suggestion that Congress may impose no
    disclosure requirements whatsoever on the President, see Oral
    Arg. Tr. 51–52 (stating it is “very difficult to think of” a
    constitutional law Congress “could pass” with respect to the
    President)—or, put another way, that the challenged subpoena
    could result in no valid legislation—would be to return to an
    “archaic view of the separation of powers” that “requir[es]
    three airtight departments of government,” Nixon 
    II, 433 U.S. at 443
    (internal quotation marks omitted). That is not the law.
    Instead, “our constitutional system imposes upon the
    Branches a degree of overlapping responsibility, a duty of
    interdependence as well as independence[,] the absence of
    which ‘would preclude the establishment of a Nation capable
    of governing itself effectively.’” Mistretta v. United States, 
    488 U.S. 361
    , 381 (1989) (quoting Buckley v. Valeo, 
    424 U.S. 1
    ,
    121 (1976)). As the Supreme Court has observed, “separation
    of powers does not mean that the branches ‘ought to have no
    partial agency in, or no controul over, the acts of each other.’”
    
    Clinton, 520 U.S. at 702
    –03 (quoting The Federalist No. 47, at
    325–326 (J. Cooke ed.1961) (emphasis in original)); see also
    44
    Nixon 
    II, 433 U.S. at 442-43
    & n.5 (affirming “the more
    pragmatic, flexible approach of Madison in the Federalist
    Papers and later of Mr. Justice Story” to the separation of
    powers); 
    Nixon, 418 U.S. at 703
    (“In designing the structure of
    our Government and dividing and allocating the sovereign
    power among three coequal branches, the Framers of the
    Constitution sought to provide a comprehensive system, but the
    separate powers were not intended to operate with absolute
    independence.”). As the Nixon cases teach, the “proper inquiry
    focuses on the extent to which [another branch’s actions]
    prevent[] the Executive branch from accomplishing its
    constitutionally assigned functions.” Nixon 
    II, 433 U.S. at 443
    (citing 
    Nixon, 418 U.S. at 711-712
    ). Congress can require the
    President to make reasonable financial disclosures without
    upsetting this balance.
    The Trump Plaintiffs challenge the constitutionality of
    legislation that “may be had” on another basis. 
    Eastland, 421 U.S. at 508
    . Drawing on the principle announced in Powell v.
    McCormack, 
    395 U.S. 486
    (1969), and U.S. Term Limits,
    Inc. v. Thornton, 
    514 U.S. 779
    (1995), that “[n]either Congress
    nor the states can add to the constitutional qualifications for
    holding federal elective office,” Walker v. United States, 
    800 F.3d 720
    , 723–24 (6th Cir. 2015), they argue that imposing
    conflict-of-interest laws on the President would impermissibly
    “change or expand the qualifications for serving as President,”
    Appellants’ Br. 38 (citing Powell and Thornton). But once
    again, we need not reach this issue. Regardless of whether
    Congress may require Presidents to “eliminat[e] [their]
    financial conflicts” through divestment or recusal, the Trump
    Plaintiffs offer no reason to suspect that a statute requiring
    nothing more than disclosure of such conflicts might also
    “‘establish a qualification for . . . serving as President.’”
    Appellants’ Br. 38 (quoting Silberman Memo 5). Financial
    disclosure laws would not, as in Powell, prevent a “duly
    45
    elected” official from assuming 
    office, 395 U.S. at 550
    , nor, as
    in U.S. Term Limits, add a term limit to “the exclusive
    qualifications set forth in the text of the 
    Constitution,” 514 U.S. at 827
    ; cf. Appellants’ Br. 39 (conceding that “[t]he
    Presidential Records Act does not add or alter the qualifications
    for office”). In the end, laws requiring disclosure exclude
    precisely zero individuals from running for or serving as
    President; regardless of their financial holdings, all
    constitutionally eligible candidates may apply.
    In sum, we detect no inherent constitutional flaw in laws
    requiring Presidents to publicly disclose certain financial
    information. And that is enough. Without treading onto any
    other potentially fertile grounds from which constitutional
    legislation could flower, we conclude that given the
    constitutionally permissible options open to Congress in the
    field of financial disclosure, the challenged subpoena seeks
    “information about a subject on which legislation may be had.”
    
    Eastland, 421 U.S. at 508
    .
    To the dissent, however, this makes no difference.
    Although acknowledging that the Committee is pursuing a
    “valid legislative inquiry,” the dissent insists that the Mazars
    subpoena is nonetheless invalid because it “seeks to investigate
    individual suspicions of criminality against the President,” an
    inquiry that “may be pursued only through impeachment.”
    Dissenting Op. at 44. In support, the dissent claims to rely on
    the “text and structure of the Constitution, its original meaning
    and longstanding practice.” 
    Id. at 3.
    Of course, the Constitution always serves as our starting
    point, and particularly in separation-of-powers disputes, we
    “put significant weight upon historical practice.” 
    Zivotofsky, 135 S. Ct. at 2091
    (internal quotations omitted). Indeed, this is
    a path the Supreme Court and this court have already
    46
    trod. Nearly a century of precedent has laid out an established
    test that resolves this inter-branch dispute in a way that, unlike
    the dissent, respects the co-equal status and roles of both the
    legislative and executive branches. Settled Supreme Court
    precedent teaches that—at least where, as here, no party argues
    that compliance with the subpoena would impair the
    President’s execution of the Article II power—the Constitution
    protects both branches’ prerogatives by determining whether
    the subpoena serves “a valid legislative purpose.” 
    Barenblatt, 360 U.S. at 127
    . Both the Trump Plaintiffs and the Department
    of Justice agree that this is the relevant inquiry. See Appellants’
    Br. 16 (“When Congress issues subpoenas in aid of valid
    legislation, it needs a legitimate legislative purpose”);
    Department Br. 10. (“The court must first determine whether
    the subpoena serves a ‘valid legislative purpose.’”).
    To be sure, a Congress pursuing a legitimate legislative
    objective may, as the many examples recounted in the dissent
    demonstrate, choose to move from legislative investigation to
    impeachment. But the dissent cites nothing in the Constitution
    or case law—and there is nothing—that compels Congress to
    abandon its legislative role at the first scent of potential
    illegality and confine itself exclusively to the impeachment
    process. Nor does anything in the dissent’s lengthy recitation
    of historical examples dictate that result. All involved
    investigations targeted at individual conduct; none involved a
    Congressional effort to investigate the need to amend existing
    laws or enact remedial legislation. Instead, those examples
    merely demonstrate that Congress has, at various points
    throughout our history, debated and decided when it wishes to
    shift from legislating to impeaching. Where legislation may be
    had—and especially here, where bills are pending and no
    intrusion on the President’s execution of his official duties is
    alleged—the Constitution assigns that decision to Congress.
    47
    Unable to prevail under the test the Supreme Court has
    enforced for more than a century, the dissent moves the
    goalposts. The dissent proposes a brand-new test for the
    President (and other “impeachable officials,” Dissenting Op. at
    44) that would enfeeble the legislative branch. According to the
    dissent, once some Members—or perhaps just one Member—
    raise “suspicions of criminality” by an impeachable official,
    Congress must “end[]” all legislative investigation and either
    do nothing at all or “move[] that part of the investigation into
    impeachment.” Dissenting Op. at 19.
    In other words, Congress must either initiate the grave and
    weighty process of impeachment or forgo any investigation in
    support of potential legislation. Under the dissent’s novel test,
    “even a valid legislative purpose” cannot “justify” the
    investigation. 
    Id. at 19.
    The dissent identifies nothing in the
    text, structure, or original meaning of Article I or Article II of
    the Constitution to support such a sweeping rule of legislative
    paralysis. As the Trump Plaintiffs and the Department of
    Justice agree, the Supreme Court has said just the opposite: “a
    congressional committee which is engaged in a legitimate
    legislative investigation need not grind to a halt whenever . . .
    crime or wrongdoing is disclosed.” 
    Hutcheson, 369 U.S. at 618
    .
    The dissent tries to house its theory in the Supreme Court’s
    decision in McGrain. Quoting the Court’s observation that an
    investigation would be invalid “if the Senate was ‘attempting
    or intending to try the Attorney General at its bar or before its
    committee for crime or wrongdoing,’” the dissent insists that
    “[i]t was essential to the Court’s decision that the investigation
    did not target the unlawful behavior of the Attorney General,”
    Dissenting Op. at 49 (quoting 
    McGrain, 273 U.S. at 179
    –80)
    (emphasis added). But as the sentence quoted by the dissent
    reveals, the Court said nothing about “targeting” specific
    conduct. Instead, the Court made clear that the investigation
    48
    was not invalid because the authorizing “resolution, like the
    charges which prompted its adoption . . . [made] reference to
    [the Attorney General] by name,” nor was it “a valid objection
    to the investigation that it might possibly disclose crime or
    wrongdoing on his part.” 
    McGrain, 273 U.S. at 179
    –80.
    Indeed, the district court in McGrain had adopted the dissent’s
    view, invalidating the subpoena because the authorizing
    resolution alleged “specific instances of . . . neglect” and the
    Senate was “proposing . . . to determine the guilt of the
    Attorney General of the shortcomings and wrongdoings set
    forth in th[ose] resolutions.” 
    Id. at 177.
    The Senate was, as the
    district court saw it, “exercising the judicial function,” a power
    “impliedly negatived by th[e] Constitution, in its provision
    conferring the sole power of impeachment on the House of
    Representatives.” Ex parte Daugherty, 
    299 F. 620
    , 639 (S.D.
    Ohio 1924). The Supreme Court labeled this reasoning
    “wrong,” explaining “that the object of the investigation . . .
    was to obtain information for legislative purposes.” 
    McGrain, 273 U.S. at 177
    .
    The dissent points to McGrain’s language that “[i]t [wa]s
    not as if an inadmissible or unlawful object were affirmatively
    and definitely avowed,” arguing that, here, the subpoena is
    invalid because “[t]he Committee has ‘affirmatively and
    definitely avowed’ its suspicions of criminality against the
    President.’” Dissenting Op. at 50–51 (quoting 
    McGrain, 273 U.S. at 180
    ). The dissent misreads that sentence. According to
    the Court, the Senate resolution in McGrain sought
    “information necessary as a basis for such legislative and other
    action as the Senate may deem necessary and 
    proper.” 273 U.S. at 179
    (emphasis added). But there was “no other action,”
    the Court explained, “which would be within the power of the
    Senate.” 
    Id. It was
    the Senate’s “indefinite and untenable
    suggestion” of non-legislative action—not an avowal of
    suspicions of individual wrongdoing—that the Court held did
    49
    not “invalidate[] the entire proceeding.” 
    Id. McGrain thus
    squarely forecloses the dissent’s theory.
    It is unsurprising that no case law supports the
    dissent. Under its view, Congress’s power to investigate, when
    it comes to the President and all other impeachable officials,
    would no longer be “co-extensive with [its] power to legislate.”
    
    Quinn, 349 U.S. at 160
    . The dissent would reorder the very
    structure of the Constitution. Throughout history, the
    Constitution has left to Congress the judgment whether to
    commence the impeachment process. But the dissent’s
    approach would not even allow Congress to make the
    quintessentially legislative judgment that some concerns about
    potential misconduct or illegality are better addressed through
    oversight and legislation than impeachment. Worse still, the
    dissent’s novel approach would now impose upon the courts
    the job of ordering the cessation of the legislative function and
    putting Congress to the Hobson’s Choice of impeachment or
    nothing.
    To be sure, the dissent would still allow Congress to “enact
    legislation.” Dissenting Op. at 64. But it would have to do so
    uninformed and with its oversight function informationally
    crippled. This would mean that, at times when oversight and
    legislation are most urgent, such as to prevent executive branch
    overreach or to keep officials’ behavior within ethical
    boundaries going forward, Congress would be legislatively
    hamstrung unless it were to pull the impeachment trigger. And
    if Congress chooses not to pursue impeachment, or if
    impeachment is unavailable because Congress believes the
    alleged misconduct falls short of a high crime or misdemeanor,
    then there can be no investigation of—and thus no viable
    legislative check on—the President at all. A proposition that so
    strips Congress of its power to legislate would enforce only the
    Executive’s arrogation of power, not the separation of powers.
    50
    At bottom, this subpoena is a valid exercise of the
    legislative oversight authority because it seeks information
    important to determining the fitness of legislation to address
    potential problems within the Executive Branch and the
    electoral system; it does not seek to determine the President’s
    fitness for office.
    C.
    Thus far we have concluded that the Committee is
    pursuing a legislative, non-law-enforcement purpose and that
    at least one kind of constitutional legislation may be had on the
    subject matter of the Committee’s investigation. What is left to
    decide is whether the documents requested in this subpoena are
    relevant to that investigation. The Trump Plaintiffs insist that
    at least some are not.
    As the Watkins Court described it, the requirement that a
    subpoena request only those documents that are relevant to a
    committee’s legitimate investigation “is a jurisdictional
    concept of pertinency drawn from the nature of a congressional
    committee’s source of 
    authority.” 354 U.S. at 206
    . Though
    complex sounding, the relevancy requirement functions merely
    as a corollary to the other restraints on congressional
    committees’ investigative powers: if a committee could
    subpoena information irrelevant to its legislative purpose, then
    the Constitution would in practice impose no real limit on
    congressional investigations.
    The Supreme Court has used various formulations to
    describe the relevancy standard that applies to congressional
    subpoenas. In McGrain, the Court held that Congress could
    subpoena any information that would “materially aid[]” a
    legitimate 
    investigation. 273 U.S. at 177
    . In Watkins, it
    explained that committees may subpoena information “to be
    used . . . in coping with a problem that falls within [their]
    51
    legislative 
    sphere.” 354 U.S. at 206
    . And in McPhaul v. United
    States, the Court offered not one but two explanations,
    validating a subpoena because, in the Court’s words, the
    subcommittee had requested records that “were not plainly
    incompetent or irrelevant to any lawful purpose . . . , but, on
    the contrary, were reasonably relevant to the inquiry.” 
    364 U.S. 372
    , 381–82 (1960) (alterations, citations, and internal
    quotation marks omitted). We read all these statements, varied
    as they are, as conveying essentially the same straightforward
    proposition: Congress may subpoena only that information
    which is “reasonably relevant” to its legitimate investigation.
    Id.; accord Appellants’ Br. 19 (“If the congressional subpoena
    is not ‘reasonably relevant to the inquiry,’ then it lacks a
    legitimate purpose.” (quoting 
    McPhaul, 364 U.S. at 381
    –82)).
    With this standard in mind, we turn to the challenged
    subpoena. Recall that it seeks four categories of documents: for
    “calendar years 2011 through 2018,” (1) “statements of
    financial condition, annual statements, periodic financial
    reports, and independent auditors’ reports,” (2) “underlying,
    supporting, or source documents and records,” and (3) related
    “memoranda, notes, and communications;” and, (4) “[w]ithout
    regard to time,” all related “engagement agreements or
    contracts.” Subpoena. For clarity, we label these four
    categories Accounting Records, Source Documents, Related
    Communications, and Engagement Agreements, respectively.
    In our view, all are reasonably relevant to remedial legislation
    addressing at least two of the topics listed in Chairman
    Cummings’s Memo: the President’s potential “undisclosed
    conflicts of interest” and the President’s “report[s] . . . to the
    Office of Government Ethics and other federal entities.”
    Cummings Memo 4.
    We begin with Accounting Records and Source
    Documents for calendar years 2014 through 2018. Because
    52
    then-Candidate and now-President Trump filed financial
    disclosure reports covering these years, financial records from
    this period are highly relevant to the Committee’s inquiry into
    whether Candidate and President Trump “accurately reported
    his finances to . . . federal entities,” 
    id., and, by
    extension,
    “whether reforms are necessary to address deficiencies with
    current laws, rules, and regulations,” Cummings Feb. 15 Letter
    9. A clear line connects the Office of Government Ethics’s May
    2018 determination that President Trump’s financial disclosure
    form failed to list “a reportable liability” to Michael Cohen,
    Apol Letter 1; to Chairman Cummings’s January 2019 requests
    to the White House and the Office of Government Ethics for
    further information on President Trump’s payments to Cohen;
    to Cohen’s February 2019 production of Mazars accounting
    documents revealing financial information different from and
    additional to Candidate and President Trump’s financial
    disclosures; and finally to the Committee’s March 2019 request
    and April 2019 subpoena to Mazars. From this logical
    progression we discern “no indication” that the subpoena
    “follow[ed] from indiscriminate dragnet procedures, lacking in
    probable cause for belief that” Mazars “possesse[s]
    information which might be helpful to the” Committee.
    
    Barenblatt, 360 U.S. at 134
    . Tellingly, the Trump Plaintiffs
    raise no relevance objection to this subset of subpoenaed
    documents.
    We next consider the same two categories of records—
    Accounting Records and Source Documents—for years 2011
    through 2013. According to the Trump Plaintiffs, these
    documents are irrelevant to the Committee’s investigation
    because they “reach[] back many years before the President
    was even a candidate for public office.” Appellants’ Reply Br.
    16–17. This is true, but beside the point. The fact that the Ethics
    in Government Act currently requires candidates and
    Presidents to disclose information for “the preceding calendar
    53
    year,” e.g., 5 U.S.C. app. 4 § 102(b)(1)(A), hardly forecloses
    Congress from amending the Act to require filers to go back a
    reasonable amount of additional time to provide a more
    accurate financial picture. That is especially true here because
    the sitting President possesses financial holdings that are
    arguably more complex than past Presidents held, has elected
    while in office to handle his finances differently than past
    Presidents did, and has declined to voluntarily release the sorts
    of tax-return information that past Presidents disclosed. See,
    e.g., H.R. 1: Strengthening Ethics: Hearing Before the House
    Committee on Oversight and Reform, 116th Cong. 125 (Feb. 6,
    2019) (statement of Walter M. Shaub, Jr.) (describing the
    President’s decision not “to divest his conflicting financial
    interests” as a “radical departure” from previous Presidents).
    Congress might therefore reasonably wonder whether the
    Ethics in Government Act needs an update, and even pre-
    candidacy documents from the President would shed light on
    that inquiry. Requiring presidential candidates and Presidents
    to disclose earlier years’ information might, for example,
    reveal forgiven debts, financial partnerships, or favorable deals
    that Congress determines should be disclosed to the public—
    that is, “undisclosed conflicts of interest.” Cummings Memo 4.
    In fact, at least one bill now pending before the House would
    require presidential candidates to “submit to the Federal
    Election Commission a copy of [their] income tax returns for
    the 10 most recent taxable years.” H.R. 706, 116th Cong.
    § 222(b)(1)(A) (2019).
    Of course, the Committee may discover nothing notable in
    Mazars’s 2011 through 2013 records. But that is not the test for
    relevancy. As the Supreme Court has explained, “[t]he very
    nature of the investigative function—like any research—is that
    it takes the searchers up some ‘blind alleys’ and into
    nonproductive enterprises.” 
    Eastland, 421 U.S. at 509
    ; see also
    54
    Appellants’ Br. 32 (conceding that “Congress cannot be
    penalized if an otherwise valid investigation turns out to be a
    dead end”). To be sure, information from the past may at some
    point become so stale as to be irrelevant to present inquiries,
    but the eight-year mark falls comfortably on the relevant side
    of the line.
    We last turn to the Committee’s request for Related
    Communications and Engagement Agreements. According to
    the Trump Plaintiffs, these documents “have nothing to do with
    the financial statements the Committee says it needs.”
    Appellants’ Reply Br. 17. But again, we think the records’
    relevancy is quite clear. As the Committee explains, the import
    of the Mazars accounting documents hinges on the conditions
    under which they were prepared—for example, whether
    Mazars accepted documents “as a given,” whether Mazars
    prepared its reports intending third parties to rely upon them,
    and whether Mazars had the “power[] or responsibilit[y]” to
    conduct independent audits. Oral Arg. Tr. 108. Obviously not
    every “agreement[]” or “note[]” will provide this information.
    Subpoena. But absent foreknowledge of the documents’
    contents, congressional investigators have no way to reliably
    determine before issuing a subpoena which specific
    communications might reveal relevant information. It is
    enough that the categories of information sought are
    “reasonably relevant” to the Committee’s legitimate legislative
    inquiry.
    IV.
    Having found no constitutional defect in the Committee’s
    subpoena to Mazars, we at last arrive at the question of
    authority: “whether the committee [is] authorized” by the full
    House “to exact the information” it seeks. 
    Rumely, 345 U.S. at 42
    –43; see also Exxon Corp. v. FTC, 
    589 F.2d 582
    , 592 (D.C.
    Cir. 1978) (“To issue a valid subpoena, . . . a committee or
    55
    subcommittee must conform strictly to the resolution
    establishing its investigatory powers.”). The Trump Plaintiffs
    urge us to interpret the House Rules narrowly to deny the
    Committee the authority it claims. But we have no need—and
    most important, no authority—to do so.
    A.
    We start with the proposition, undisputed by the Trump
    Plaintiffs, that under the most natural reading of the House
    Rules, the full chamber has authorized the Committee to issue
    the challenged subpoena. See Oral Arg. Tr. 38–39 (Trump
    Plaintiffs conceding that the Rules, under a “normal reading,”
    authorize the subpoena). A brief tour through the Rules
    confirms as much.
    To begin with, the Rules vest the Oversight Committee
    with standing authority to institute investigations and issue
    subpoenas without first “obtain[ing] such authority . . . by a
    separate resolution.” House Rules and Manual, 115th Cong.,
    § 788 note (2017); see also Morton Rosenberg, When Congress
    Comes Calling: A Study on the Principles, Practices, and
    Pragmatics of Legislative Inquiry 33–34 & 34 n.5 (2017)
    (explaining that although “[t]he required authorization from the
    full House . . . may take the form of a statute, a resolution, or a
    standing rule of the House,” “[t]his [last] mode is the most
    common today” (footnotes omitted)). Clause 1(b)(1) of House
    Rule XI permits “[e]ach committee [to] conduct at any time
    such investigations and studies as it considers necessary.” And
    Clause 2(m) of the same Rule authorizes committees—or,
    when the committees so choose, their chairs—“to require, by
    subpoena or otherwise, . . . the production of such books,
    records, correspondence, memoranda, papers, and documents
    as [they] consider[] necessary” “[f]or the purpose of carrying
    out any of [their] functions and duties under . . . rule X.” House
    Rule XI, cl. 2(m)(1); see also 
    id. cl. 2(m)(3)(A)(i)
    (permitting
    56
    committees to “delegate[] to the[ir] chair” “[t]he power to
    authorize and issue subpoenas”); Rules of the House
    Committee on Oversight and Reform, 116th Cong., Rule 12(g)
    (2019) (authorizing the Oversight Committee Chair to “issue
    subpoenas as provided in House Rule XI, clause 2(m), in the
    conduct of any investigation or activity or series of
    investigations or activities within the jurisdiction of the
    Committee”).
    Rule X, in turn, establishes the Oversight Committee’s
    jurisdiction, which unquestionably includes financial-
    disclosure and other ethics-in-government laws. Rule X, clause
    1(n) assigns the Committee jurisdiction over the “[f]ederal civil
    service . . . and the status of officers and employees of the
    United States,” “[g]overnment management and accounting
    measures generally,” and “[p]ublic information and records.”
    Pursuant to this clause, the Oversight Committee has for
    decades exercised jurisdiction over the Ethics in Government
    Act and served as the authorizing committee for the Office of
    Government Ethics. See, e.g., 165 Cong. Rec. H1209 (daily ed.
    Jan. 24, 2019) (referring H.R. 745, a “bill to amend the Ethics
    in Government Act of 1978 to provide for reform in the
    operations of the Office of Government Ethics, . . . to the
    Committee on Oversight and Reform”); Letter from Jason
    Chaffetz, Chairman, House Committee on Oversight and
    Government Reform, to Walter M. Shaub, Jr., Director, Office
    of Government Ethics 2 (Jan. 12, 2017) (stating that the
    Oversight Committee “has jurisdiction in the House of
    Representatives for reauthorizing the [O]ffice” of Government
    Ethics); see also H.R. Rep. No. 95-642, pt. 1 (1977) (report of
    the Committee on Post Office and Civil Service, predecessor
    to the Oversight Committee, on H.R. 6954, predecessor to the
    Ethics in Government Act of 1978). Furthermore, Rule X,
    clause 3(i) directs the Oversight Committee to “review and
    study on a continuing basis the operation of Government
    57
    activities at all levels, including the Executive Office of the
    President.” And lest any confusion remain regarding the
    Oversight Committee’s authority to oversee, Rule X,
    clause 4(c)(2) states that the Committee “may at any time
    conduct investigations of any matter without regard to [any
    other] clause conferring jurisdiction over the matter to another
    standing committee.”
    Having placed “any matter” within the Oversight
    Committee’s wide purview, the Rules nowhere disclose an
    intent to carve out the President. It would be quite strange for
    the Rules to permit the Oversight Committee to “review and
    study,” House Rule X, cl. 3(i), financial disclosure laws in all
    their applications save for one—their application to the
    President. See 5 U.S.C. app. 4 §§ 101(a), (f)(1), 102 (requiring
    the President to file financial reports). So, too, would it be
    strange to direct the Committee to oversee “the operation of
    Government activities at all levels,” House Rule X, cl. 3(i), if
    the Rules really meant “at all levels except the President.” And
    although we do not read the second half of clause 3(i), which
    specifies that “Government . . . at all levels . . . includ[es] the
    Executive Office of the President,” to refer to the President
    himself, cf. Kissinger v. Reporters Committee for Freedom of
    the Press, 
    445 U.S. 136
    , 156 (1980) (holding that in the
    Freedom of Information Act, the term “‘Executive Office’ does
    not include the Office of the President”), neither do we take the
    “including” phrase to imply that “Government activities at all
    levels” means something less than “all,” see Federal Land
    Bank of St. Paul v. Bismarck Lumber Co., 
    314 U.S. 95
    , 100
    (1941) (“[T]he term ‘including’ is not one of all-embracing
    definition, but connotes simply an illustrative application of the
    general principle.”). Indeed, the Trump Plaintiffs urge us to
    draw no such negative inference. See Appellants’ Reply Br. 6
    (“Plaintiffs do not claim that [adding the] new language
    58
    [‘Executive Office of the           President’]   narrowed    the
    Committee’s authority.”).
    B.
    Acknowledging that literally read, the Rules permit the
    Committee to issue the challenged subpoena, 
    see supra
    at 49,
    the Trump Plaintiffs insist that a literal reading is not enough.
    In their view, the Mazars subpoena alters the separation of
    powers and raises serious constitutional questions, so nothing
    less than an “unequivocal[] grant” by the House of “jurisdiction
    to subpoena the President’s accountant for his private financial
    records” could authorize the Committee to issue it. Appellants’
    Reply Br. 2; see also Dissenting Op. at 52–58. In support, they
    raise three related arguments.
    First, the Trump Plaintiffs contend that because “a ‘clear
    statement rule’ applies ‘to statutes that significantly alter the
    balance between Congress and the President,’” Appellants’ Br.
    16 (quoting Armstrong v. Bush, 
    924 F.2d 282
    , 289 (D.C. Cir.
    1991)), the House could have “authorized the Committee to
    embark on [the instant] investigation” only through “an express
    statement,” Appellants’ Reply Br. 3 (internal quotation marks
    omitted); see also Dissenting Op. at 54–55. For this
    proposition, they rely primarily on two decisions, both of
    which held that the President is not an “agency” subject to
    judicial review under the Administrative Procedure Act (APA).
    In the first case, Armstrong v. Bush, our court held that “[w]hen
    Congress decides purposefully to enact legislation restricting
    or regulating presidential action, it must make its intent 
    clear.” 924 F.2d at 289
    . “Although the ‘clear statement’ rule was
    originally articulated to guide interpretation of statutes that
    significantly alter the federal-state balance,” we explained,
    “there are similar compelling reasons to apply the rule to
    statutes that significantly alter the balance between Congress
    and the President.” 
    Id. And in
    the second case, Franklin v.
    59
    Massachusetts, the Supreme Court confirmed that “[o]ut of
    respect for the separation of powers and the unique
    constitutional position of the President,” the Court “would
    require an express statement by Congress before assuming it
    intended the President’s performance of his statutory duties to
    be reviewed for abuse of discretion” under the APA. 
    505 U.S. 788
    , 800–01 (1992).
    This case is nothing like Armstrong and Franklin for a
    simple reason: the House Rules have no effect whatsoever on
    “the balance between Congress and the President.” 
    Armstrong, 924 F.2d at 289
    (emphasis added). What Rules X and XI have
    done is delegate from the House to the Oversight Committee
    the authority to exercise Congress’s subpoena power without
    first “obtain[ing] such authority . . . by a separate resolution”
    of the full House. House Rules and Manual, 115th Cong., § 788
    note (2017). The Trump Plaintiffs nowhere dispute that,
    assuming a legitimate legislative purpose exists, the House
    could have either issued the challenged subpoena by a vote of
    the full chamber or, via express statement, authorized the
    Committee to issue the subpoena on its behalf. See Oral Arg.
    Tr. 5 (conceding that the House has the power to issue the
    subpoena itself and arguing that the question is “whether [it]
    gave [that authority] to [the] Committee”); 
    id. at 6
    (stating that
    it is “a question of clarity and not a question of power”); 
    id. at 130–31
    (stating that, although it would be “better” for the
    subpoena to come from “the full House,” the full House could
    pass a rule that “says . . . the committee could do it”). The
    Rules, which establish a mechanism for exercising the House’s
    subpoena power, thus deal exclusively with the allocation of
    authority within the legislative branch, leaving unaltered the
    House’s subpoena power vis-à-vis the President. Because
    Congress already possesses—in fact, has previously exercised,
    
    see supra
    at 16–17—the authority to subpoena Presidents and
    their information, nothing in the House Rules could in any way
    60
    “alter the balance between” the two political branches of
    government. 
    Armstrong, 924 F.2d at 289
    .
    The Trump Plaintiffs’ second argument, containing many
    ingredients of their first, is similarly unavailing. Observing that
    “[t]he parties seriously dispute whether the subpoena has a
    legitimate legislative purpose,” Appellants’ Reply Br. 3—and,
    consequently, whether the subpoena exceeds constitutional
    limits on Congress’s subpoena power—the Trump Plaintiffs
    urge us to “resolve[] this case in a way that avoid[s] deciding”
    constitutional questions “by quashing the subpoena as beyond
    the Committee’s . . . jurisdiction,” Appellants’ Br. 23; see also
    Department Br. 14; Dissenting Op. at 52–58. They call our
    attention to two cases in particular: the Supreme Court’s
    decision in United States v. Rumely and ours in Tobin v. United
    States, 
    306 F.2d 270
    (D.C. Cir. 1962). In Rumely, the Court
    “g[a]ve” the authorizing resolution at issue “a more restricted
    scope” because the government’s favored interpretation, which
    would have permitted it “to inquire into all efforts of private
    individuals to influence public opinion through books and
    periodicals,” raised “doubts of constitutionality in view of the
    prohibition of the First Amendment” and thus presented a
    “[g]rave constitutional question[].” 
    Rumely, 345 U.S. at 46
    –48.
    And in the latter, we “constru[ed] [a] resolution[] of authority
    narrowly . . . in order to obviate the necessity of passing on”
    the “serious and difficult constitutional question[]” presented
    by that case, 
    Tobin, 306 F.2d at 274
    –75—namely, whether
    Congress has “the power, under the compact clause of the
    Constitution, to ‘alter, amend or repeal’ its consent to an
    interstate compact,” 
    id. at 272.
    Concerned that “the suspicion
    of even potential impermanency would be damaging to the
    very concept of interstate compacts,” 
    id. at 273,
    we observed
    that the argument against recognizing such an implied power
    to alter or repeal “is not unpersuasive,” 
    id. at 274.
                                    61
    In contrast to Rumely and Tobin, the constitutional
    questions raised here are neither “[g]rave,” 
    Rumely, 345 U.S. at 48
    , nor “serious and difficult,” 
    Tobin, 306 F.2d at 275
    . We
    harbor no doubts that the subpoena to Mazars comports with
    constitutional limits, as it seeks documents reasonably relevant
    to a legitimate legislative inquiry into “a subject on which
    legislation may be had.” 
    Eastland, 421 U.S. at 508
    ; 
    see supra
    Parts III.A–C. We therefore have no cause to invoke the canon
    of constitutional avoidance. See Empresa Cubana Exportadora
    de Alimentos y Productos Varios v. U.S. Department of
    Treasury, 
    638 F.3d 794
    , 801 (D.C. Cir. 2011) (“A clear statute
    and a weak constitutional claim are not a recipe for successful
    invocation of the constitutional avoidance canon.”).
    That is not to say the issues presented here are
    unimportant—far from it. But the canon of constitutional
    avoidance “is not a license for the judiciary to rewrite language
    enacted by the legislature.” United States v. Albertini, 
    472 U.S. 675
    , 680 (1985). To adopt a restrictive interpretation of the
    Rules when uncompelled by constitutional concerns, “while
    purporting to be an exercise in judicial restraint,” would in fact
    be to “trench upon the legislative powers vested in Congress by
    [Article I] of the Constitution.” 
    Id. We have
    no authority to
    avoid questions—even important ones—simply because we
    might prefer not to answer them. Cf. United States v. American
    Telephone & Telegraph Co., 
    567 F.2d 121
    , 126 (D.C. Cir.
    1977) (“The simple fact of a conflict between the legislative
    and executive branches over a congressional subpoena does not
    preclude judicial resolution.”).
    Finally, the Trump Plaintiffs argue that even if no
    separation-of-powers concerns demand application of the clear
    statement rule, and even if no constitutional questions rise to
    the level of serious, it would, given the “sensitive” nature of the
    Committee’s request, Appellants’ Reply Br. 2 (internal
    62
    quotation marks omitted), still be “better,” Oral Arg. Tr. 130,
    for the full House to grant the Committee “express authority to
    subpoena the President for his personal financial records,”
    Appellants’ Reply Br. 5. We, however, have no authority to
    impose such a requirement on the House. The Constitution
    gives “[e]ach House” of Congress authority to “determine the
    Rules of its Proceedings,” U.S. Const. art. I, § 5, cl. 2, meaning
    that courts lack the power to invalidate a duly authorized
    congressional subpoena merely because it might have been
    “better [if] . . . the full House” had specifically authorized or
    issued it, Oral Arg. Tr. 130. See 
    Eastland, 421 U.S. at 509
    (“The wisdom of congressional approach or methodology is
    not open to judicial veto.”). To be sure, “the courts will
    intervene to protect constitutional rights from infringement by
    Congress, including its committees and members.” Exxon
    
    Corp., 589 F.2d at 590
    . But unless and until Congress adopts a
    rule that offends the Constitution, the courts get no vote in how
    each chamber chooses to run its internal affairs. See 
    id. (“[W]here constitutional
    rights are not violated, there is no
    warrant for the judiciary to interfere with the internal
    procedures of Congress.”).
    The trouble with clear statement rules, then, is that they
    both “involve[] an unwillingness to give full effect to
    [Congress’s] unambiguous text” as it exists now, Owner-
    Operator Independent Drivers Ass’n v. U.S. Department of
    Transportation, 
    724 F.3d 230
    , 237 (D.C. Cir. 2013), and offer
    a not-so-subtle encouragement to Congress to alter its rules in
    the future. Without some constitutionally compelled reason, we
    may do neither. As our court recently explained, “interpreting
    a congressional rule ‘differently than would the Congress
    itself,’ is tantamount to ‘making the Rules—a power that the
    Rulemaking Clause reserves to each House alone.’” Barker v.
    Conroy, 
    921 F.3d 1118
    , 1130 (D.C. Cir. 2019) (quoting United
    States v. Rostenkowski, 
    59 F.3d 1291
    , 1306–07 (D.C. Cir.
    63
    1995)). Accordingly, absent a substantial constitutional
    question pertaining to the House’s legislative power, we have
    no more authority to give a cramped interpretation to a House
    Rule via a clear statement requirement or the constitutional
    avoidance canon than we do to take out our red pens and edit
    the Rules ourselves.
    But the House may. And indeed it has. On July 24, several
    weeks after oral argument in this case and several months after
    the Oversight Committee issued the challenged subpoena to
    Mazars, the full House adopted a resolution that in no uncertain
    terms “ratifie[d] and affirm[ed]” the Oversight Committee’s
    authority under House Rules X and XI to issue subpoenas
    “concerning . . . the President in his personal or official
    capacity [and] his immediate family, business entities, or
    organizations.” H.R. Res. 507, 116th Cong. (2019). Resolution
    507—a resolution “[a]ffirming the validity of subpoenas duly
    issued and investigations undertaken by . . . committee[s] of
    the House . . . pursuant to authorities delegated by . . . the
    [House] Rules,” id.—purports neither to enlarge the
    Committee’s jurisdiction nor to amend the House Rules.
    Instead, the Resolution clarifies the authority that the
    Committee had on the day it issued the subpoena. It is “plainly
    incorrect,” the Resolution states, to assert that previously
    issued subpoenas “seeking personal, financial, banking, and tax
    information related to the President” “were not authorized by
    the full House.” 
    Id. Because the
    Trump Plaintiffs concede, as they must, that
    “[t]he Resolution does not expand the Committee’s
    jurisdiction,” Appellants’ July 31 Letter 1; see also Dissenting
    Op. at 55 n.18, we need not address their argument that “the
    ‘scope’ of a committee’s jurisdiction must ‘be ascertained as of
    th[e] time’ of the request,” 
    id. (alteration in
    original) (quoting
    
    Rumely, 345 U.S. at 48
    ). The Trump Plaintiffs may very well
    64
    be right that the authority of a congressional committee to issue
    subpoenas “‘cannot be enlarged by subsequent action of
    Congress.’” Id. (quoting 
    Rumely, 345 U.S. at 48
    ); but cf.
    Dombrowski v. Burbank, 
    358 F.2d 821
    , 825 (D.C. Cir. 1966),
    aff’d in part, rev’d in part on other grounds sub nom.
    Dombrowski v. Eastland, 
    387 U.S. 82
    (1967) (holding that for
    purposes of establishing immunity from suit, a subcommittee
    could ratify a subpoena previously issued “without prior
    authorization from the [s]ubcommittee”). Resolution 507,
    however, “enlarges” nothing. It merely confirms what the
    Trump Plaintiffs admit—that the plain text of the House Rules
    authorizes the subpoena, 
    see supra
    at 46, and merely provides
    what the Trump Plaintiffs request—that the House “‘spell[] out
    [its] intention’” by “‘adopt[ing] a resolution which in express
    terms authorizes’” the challenged subpoena. Appellants’ Reply
    Br. 8–9 (quoting 
    Tobin, 306 F.2d at 275
    –76). Because the
    House has “clearly manifest[ed] its intention of putting such a
    decisional burden upon us,” we have no choice but to “meet
    and decide” the issues presented by this case. 
    Tobin, 306 F.2d at 276
    .
    The Justice Department adds one final objection. Although
    conceding that the Resolution “clearly authorizes the
    Committee’s subpoena[,]” Department Br. 16, the Department
    warns that because Resolution 507 also authorizes future
    subpoenas, there is a “serious risk” that “[C]ongressional
    committees may issue successive subpoenas in waves, making
    far-reaching demands that harry the President and distract his
    attention.” Department Br. 6. Time will tell whether the
    Department’s prediction is accurate. At present, however, we
    have no need to consider that hypothetical scenario because the
    only subpoena currently before us is the one directed at Mazars.
    And to be clear, neither the Trump Plaintiffs nor the
    Department has argued that compliance with that subpoena
    risks unconstitutionally burdening the President’s core duties.
    65
    Nor could they. It is Mazars, a third-party, that will retrieve
    and organize the relevant information; the subpoena seeks non-
    confidential records in which the President has asserted no
    proprietary or evidentiary protections; and Mazars, not the
    President, risks contempt through non-compliance. To be sure,
    monitoring Mazars’s compliance with the subpoena might
    require some presidential time and attention. But as the
    Supreme Court made clear in Clinton v. Jones, a “burden [on]
    the time and attention of the Chief Executive,” standing alone,
    “is not sufficient to establish a violation of the 
    Constitution.” 520 U.S. at 703
    .
    V.
    Though our journey has been long, we find ourselves at
    the end of a familiar tale. A congressional committee, as
    committees have done repeatedly over the past two centuries,
    issued an investigative subpoena, and the target of that
    subpoena, questioning the committee’s legislative purpose, has
    asked a court to invalidate it. The fact that the subpoena in this
    case seeks information that concerns the President of the
    United States adds a twist, but not a surprising one: disputes
    between Congress and the President are a recurring plot in our
    national story. And that is precisely what the Framers intended.
    As Justice Brandeis wrote, “[t]he doctrine of the separation of
    powers was adopted . . . not to promote efficiency but to
    preclude the exercise of arbitrary power.” Myers v. United
    States, 
    272 U.S. 52
    , 293 (1926) (Brandeis, J., dissenting). “The
    purpose,” he explained, “was not to avoid friction, but, by
    means of the inevitable friction incident to the distribution of
    the governmental powers among three departments, to save the
    people from autocracy.” 
    Id. Having considered
    the weighty interests at stake in this
    case, we conclude that the subpoena issued by the Committee
    66
    to Mazars is valid and enforceable. We affirm the district
    court’s judgment in favor of the Oversight Committee and
    against the Trump Plaintiffs.
    So ordered.
    RAO, Circuit Judge, dissenting: The majority breaks new
    ground when it determines Congress is investigating
    allegations of illegal conduct against the President, yet
    nonetheless upholds the subpoena as part of the legislative
    power. The Committee on Oversight and Reform has
    consistently maintained that it seeks to determine whether the
    President broke the law, but it has not invoked Congress’s
    impeachment power to support this subpoena. When Congress
    seeks information about the President’s wrongdoing, it does
    not matter whether the investigation also has a legislative
    purpose. Investigations of impeachable offenses simply are
    not, and never have been, within Congress’s legislative power.
    Throughout our history, Congress, the President, and the courts
    have insisted upon maintaining the separation between the
    legislative and impeachment powers of the House and
    recognized the gravity and accountability that follow
    impeachment. Allowing the Committee to issue this subpoena
    for legislative purposes would turn Congress into a roving
    inquisition over a co-equal branch of government. I
    respectfully dissent.
    I.
    We are asked to determine whether the Committee’s
    subpoena is within the legislative power, a question that raises
    serious separation of powers concerns about how a House
    committee may investigate a sitting president. The
    constitutional questions only hinted at by the majority become
    clearer when the proper framework is applied. First, the
    Committee’s subpoena and investigation explicitly state a
    purpose of investigating illegal conduct of the President,
    including specific violations of ethics laws and the
    Constitution. Second, Congress’s power to investigate for
    legislative purposes, although broad, is not unlimited and
    cannot circumvent the distinct power to investigate for
    purposes of impeachment. Allegations that an impeachable
    official acted unlawfully must be pursued through
    impeachment. Finally, the subpoena targets the President and
    2
    raises implications for the separation of powers that the
    majority cannot brush aside simply because the subpoena is
    addressed to the President’s accountants, Mazars USA, LLP.
    These preliminary matters place this novel investigation in
    context and frame the analysis of the substantial constitutional
    questions presented in this case.
    The Committee, the Trump plaintiffs, and the majority all
    agree that the most relevant document for assessing the
    Committee’s reasons for issuing the subpoena is Chairman
    Elijah E. Cummings’s April 12 Memorandum. See
    Memorandum from Chairman Elijah E. Cummings to
    Members of the Committee on Oversight and Reform (Apr. 12,
    2019) (“Cummings Memorandum”); Appellant Br. 32–33;
    Maj. Op. 25; cf. Wilkinson v. United States, 
    365 U.S. 399
    , 410
    (1961) (looking to the “Chairman’s statement at the opening of
    the hearings” for signs of legislative purpose); Shelton v.
    United States, 
    404 F.2d 1292
    , 1297 (D.C. Cir. 1968). The
    Cummings Memorandum states the Committee is investigating
    “whether the President may have engaged in illegal conduct”
    and notes that this information will “inform[] its review of
    multiple laws and legislative proposals under our jurisdiction.”
    Cummings Memorandum at 4. The Committee also makes an
    “express avowal” to investigate alleged violations of ethics
    laws and the Constitution by the President. See McGrain v.
    Daugherty, 
    273 U.S. 135
    , 178 (1927) (noting that “[a]n express
    avowal of the object” of an investigation would aid the courts
    in reviewing the Senate’s purpose); see also infra Part III.A
    (discussing Committee’s purposes in detail).
    The Committee announces two distinct investigations: one
    to explore allegations of illegal conduct by the President; and
    another to review multiple laws and legislative proposals
    within the Committee’s jurisdiction. The Committee justifies
    both inquiries under the legislative power, and the majority
    accepts this framework when it examines the legislative power
    3
    in isolation to determine whether this investigation falls within
    its scope. Maj. Op. 20–54. Yet the Constitution vests the House
    of Representatives with more than one investigative power.
    Most frequently, the House investigates and issues subpoenas
    ancillary to its legislative powers. That investigative power is
    “co-extensive with the power to legislate.” Quinn v. United
    States, 
    349 U.S. 155
    , 160 (1955); see also Watkins v. United
    States, 
    354 U.S. 178
    , 187 (1957) (“The power of the Congress
    to conduct investigations is inherent in the legislative process.
    That power is broad.”).
    The House, however, has a separate power to investigate
    pursuant to impeachment, which has always been understood
    as a limited judicial power to hold certain impeachable officials
    accountable for wrongdoing. 1 See Kilbourn v. Thompson, 
    103 U.S. 168
    , 191 (1880) (“The Senate also exercises the judicial
    power of trying impeachments, and the House of preferring
    articles of impeachment.”). The text and structure of the
    Constitution, its original meaning, and longstanding practice
    demonstrate that Congress’s legislative and judicial powers are
    distinct and exercised through separate processes, for different
    purposes, and with entirely different protections for individuals
    targeted for investigation. See infra Part II.
    1
    In addition to the legislative and impeachment powers, the House
    and the Senate have other investigative powers, not relevant here, to
    maintain the integrity of their proceedings and members against
    bribery, nuisance, and violence. See Anderson v. Dunn, 19 U.S. (6
    Wheat.) 204, 228–30 (1821); Barry v. United States ex rel.
    Cunningham, 
    279 U.S. 597
    , 613 (1929) (the Senate has “certain
    powers, which are not legislative, but judicial, in character. Among
    these is the power to judge of the elections, returns, and
    qualifications of its own members.” (citing U.S. CONST. art. I, § 5,
    cl. 1)).
    4
    The Committee’s investigation into alleged illegal actions
    of the President naturally raises the specter of impeachment.
    Although the Trump plaintiffs maintain that “[t]he one thing
    the parties agree on is that this case is not about impeachment,”
    Appellants Br. 14, the impeachment power unmistakably sits
    in the background of the legal arguments. 2 The Trump
    plaintiffs and the Department of Justice have suggested that the
    impeachment power might provide a different source of
    authority for this subpoena, even though it was not invoked
    here. See Appellants Br. 45 (noting with regard to
    impeachment that “[w]hile Congress could presumably use
    subpoenas to advance these non-legislative powers, the
    Committee has not invoked them”); DOJ Br. 15 n.1 (“The
    House’s impeachment power is an express authority whose
    exercise does not require a connection to valid legislation. But
    the Committee has asserted neither jurisdiction over, nor an
    objective of pursuing, impeachment.”). Furthermore, one of the
    primary legal arguments raised by the Trump plaintiffs is that
    the Committee’s investigation is an impermissible form of “law
    enforcement.” Appellants Br. 33–37. While law enforcement is
    normally the province of the executive branch, the House has a
    narrowly circumscribed power to serve as the “NATIONAL
    INQUEST” when it acts pursuant to the impeachment power.
    The Federalist No. 65, at 338 (Alexander Hamilton) (George
    W. Carey & James McClellan eds., 2001). The Committee is
    2
    Notably, the district court concluded that the impeachment and
    removal powers of the House and the Senate somehow bolster
    Congress’s ability to investigate the President through the legislative
    power. See Trump v. Comm. on Oversight & Reform, 
    380 F. Supp. 3d
    76, 95 (D.D.C. 2019) (“It is simply not fathomable that a
    Constitution that grants Congress the power to remove a President
    for reasons including criminal behavior would deny Congress the
    power to investigate him for unlawful conduct—past or present—
    even without formally opening an impeachment inquiry.”).
    5
    “not here relying on impeachment power.” Oral Arg. at
    1:34:19–22. Nevertheless, understanding the impeachment
    power is essential to identifying the limits of the legislative
    power when Congress seeks to investigate allegations of
    specific unlawful actions by the President.
    Constitutional powers do not stand in isolation, but rather
    are part of a complex structure in which each power acquires
    specific content and meaning in relation to the others. The
    Supreme Court often locates the limits of one constitutional
    power by identifying what is at the core of another. See, e.g.,
    Zivotofsky ex rel. Zivotofsky v. Kerry, 
    135 S. Ct. 2076
    , 2096
    (2015) (“Congress has substantial authority over passports . . . .
    [But] [t]o allow Congress to control the President’s
    communication in the context of a formal recognition
    determination is to allow Congress to exercise that exclusive
    power itself.”); Bowsher v. Synar, 
    478 U.S. 714
    , 722 (1986)
    (“The Constitution does not contemplate an active role for
    Congress in the supervision of officers charged with the
    execution of the laws it enacts.”); Youngstown Sheet & Tube
    Co. v. Sawyer, 
    343 U.S. 579
    , 587 (1952) (“In the framework of
    our Constitution, the President’s power to see that the laws are
    faithfully executed refutes the idea that he is to be a
    lawmaker.”); Myers v. United States, 
    272 U.S. 52
    , 164 (1926)
    (“[A]rticle 2 excludes the exercise of legislative power by
    Congress to provide for appointments and removals, except
    only as granted therein to Congress in the matter of inferior
    offices.”); 
    Kilbourn, 103 U.S. at 192
    (the House “not only
    exceeded the limit of its own authority, but assumed a power
    which could only be properly exercised by another branch of
    the government, because it was in its nature clearly judicial”).
    This method helps illuminate the scope of the legislative power
    to investigate. Comparing Congress’s legislative power with its
    wholly distinct judicial power of impeachment demonstrates
    the essential difference between these powers when Congress
    seeks to investigate the wrongdoing of the President.
    6
    As explained below, allegations of illegal conduct against
    the President cannot be investigated by Congress except
    through impeachment. The House may impeach for “Treason,
    Bribery, or other high Crimes and Misdemeanors,” U.S.
    CONST. art. II, § 4, and has substantial discretion to define and
    pursue charges of impeachment. See The Federalist No. 65, at
    338 (impeachable offenses “are of a nature which may with
    peculiar propriety be denominated POLITICAL, as they relate
    chiefly to injuries done immediately to the society itself”).
    While it is unnecessary here to determine the scope of
    impeachable offenses, Congress has frequently treated
    violations of statutes or the Constitution as meeting this
    threshold. 3 Impeachment provides the exclusive method for
    Congress to investigate accusations of illegal conduct by
    impeachable officials, particularly with the aid of compulsory
    process. 4 Thus, the key determination is whether this
    3
    This discussion of the impeachment power proceeds only in relation
    to understanding the scope of the legislative power. As the
    Committee has not raised the impeachment power as a basis for this
    subpoena, questions regarding whether such a subpoena could issue
    under the impeachment power are outside the scope of this opinion,
    as are other questions regarding the justiciability of the impeachment
    power or the specific scope of impeachable offenses. Recognizing
    the political nature of impeachable offenses, I refer to them
    throughout the opinion by various terms to reflect that such offenses
    may include wrongdoing or illegal conduct deemed by the House to
    be a high crime or misdemeanor.
    4
    Voluntary compliance with congressional investigations is
    commonplace. Different concerns arise, however, when one branch
    invokes power over the other through compulsory process. See, e.g.,
    
    Watkins, 354 U.S. at 215
    (“It is only those investigations that are
    conducted by use of compulsory process that give rise to a need to
    protect the rights of individuals against illegal encroachment. That
    protection can be readily achieved through procedures which prevent
    7
    investigation targets allegations Congress might treat as “high
    Crimes” or “Misdemeanors.” To make this determination
    requires no search for hidden motives, but simply crediting the
    Committee’s consistently stated purpose to investigate “illegal
    conduct” of the President. Cummings Memorandum at 4; cf.
    Eastland v. United States Servicemen’s Fund, 
    421 U.S. 491
    ,
    508 (1975) (“[I]n determining the legitimacy of a congressional
    act we do not look to the motives alleged to have prompted
    it.”).
    The Committee’s stated interest in remedial legislation
    may support any number of investigations, including into the
    conduct of agencies and how officials administer the laws. Yet
    a legislative purpose cannot whitewash this subpoena, which—
    by the Committee’s own description—targets allegations of
    illegal conduct by the President. The most important question
    is not whether Congress has put forth some legitimate
    legislative purpose, but rather whether Congress is
    investigating suspicions of criminality or allegations that the
    President violated a law. Such investigations may be pursued
    exclusively through impeachment. The House may not use the
    legislative power to circumvent the protections and
    accountability that accompany the impeachment power.
    The majority recognizes this subpoena concerns the
    Committee’s “interest in determining whether and how illegal
    conduct has occurred,” Maj. Op. 30, but nonetheless concludes
    that it is a valid exercise of the legislative power. This marks a
    sharp break with the few judicial precedents in this area. The
    Supreme Court has consistently maintained that Congress
    cannot undertake a legislative investigation of an impeachable
    official if the “gravamen” of the investigation rests on
    “suspicions of criminality.” 
    Kilbourn, 103 U.S. at 193
    , 195. In
    the separation of power from responsibility and which provide the
    constitutional requisites of fairness for witnesses.”).
    8
    Senate Select Committee on Presidential Campaign Activities
    v. Nixon, our court refused to enforce a legislative subpoena to
    President Richard Nixon by the Senate Select Committee
    tasked with investigating the Watergate break-in. 
    498 F.2d 725
    (D.C. Cir. 1974) (en banc). The tapes sought by the subpoena
    were too “tangential” to the Committee’s asserted legislative
    purposes, especially because the House had commenced
    impeachment proceedings to ascertain the President’s role in
    these events. 
    Id. at 733.
           The majority’s holding also breaks with the longstanding
    historical practice of Congress and the Executive. Without
    analyzing the Constitution or responding to the consistent
    historical understanding presented below, the majority simply
    asserts that Congress must be able “to make the
    quintessentially legislative judgment that some concerns about
    potential misconduct or illegality are better addressed through
    . . . legislation than impeachment.” Maj. Op. 49. The majority’s
    novel holding, however, fails to explain how specific
    accusations of wrongdoing by impeachable officials can be
    pursued through legislation. The Constitution, historical
    practice, and our cases prohibit rolling this investigation of
    illegal conduct of the President into a legislative investigation.
    Allowing Congress to use the legislative power to circumvent
    the impeachment process disrupts the separation of powers. By
    simply invoking a need for remedial legislation, Congress may
    now expand its control over the other branches and avoid the
    accountability and responsibility inherent in the impeachment
    power.
    Finally, the inter-branch conflict in this case does not
    dissipate simply because the subpoena for the President’s
    papers is strategically directed to Mazars rather than the
    President. In an attempt to sidestep thorny separation of powers
    questions, the majority reduces the conflict to a merely
    personal one involving the President’s accountants: “[T]o
    9
    resolve this case, we need not decide whether the Constitution
    permits Congress, in the conduct of a legislative—that is, non-
    impeachment—investigation, to issue subpoenas to a sitting
    President.” 
    Id. at 20.
    By the majority’s account, the subpoena
    does not transgress any constitutionally prescribed boundaries
    between co-equal branches in part because “quite simply, the
    Oversight Committee has not subpoenaed President Trump.”
    
    Id. The majority
    thus concludes that concerns about the relative
    powers of the President and Congress do not come into play.
    Yet this claim belies both precedent and common sense.
    Indeed, by the end of its opinion, the majority abandons even
    this reservation and simply asserts, “Congress already
    possesses . . . the authority to subpoena Presidents and their
    information.” 
    Id. at 59.
         The official actions of the Chief Executive are essentially
    bound up in the Mazars subpoena. A subpoena’s force extends
    beyond its recipient, which the majority has implicitly
    acknowledged by declining to question President Trump’s
    standing to challenge the subpoena’s validity. As we have
    previously explained: “[T]he fortuity that documents sought by
    a congressional subpoena are not in the hands of a party
    claiming injury from the subpoena should not immunize that
    subpoena from challenge by that party . . . . The fact that the
    Executive is not in a position to assert its claim of constitutional
    right by refusing to comply with a subpoena does not bar the
    challenge.” United States v. AT&T, 
    567 F.2d 121
    , 129 (D.C.
    Cir. 1977) (citing 
    Eastland, 421 U.S. at 513
    (Marshall, J.,
    concurring)). Moreover, we have recognized that
    congressional subpoenas may create a “portentous clash
    between the executive and legislative branches”
    notwithstanding the fact that the subpoena was issued against a
    private party. United States v. AT&T, 
    551 F.2d 384
    , 385 (D.C.
    Cir. 1976); accord 
    Eastland, 421 U.S. at 498
    , 501 n.14
    (reviewing challenge to third-party subpoena because
    10
    otherwise “compliance by the third person could frustrate any
    judicial inquiry”).
    The Committee’s subpoena is directed to Mazars but
    targets the President’s papers. The form of the subpoena cannot
    mask the inter-branch conflict between Congress and the
    President. Cf. Judicial Watch, Inc. v. U.S. Secret Serv., 
    726 F.3d 208
    , 225–26 (D.C. Cir. 2013) (refusing to allow “end
    runs” around “separation-of-powers concerns” by subpoenaing
    the Secret Service instead of the President for presidential
    calendars). Despite the majority’s skepticism, President Trump
    necessarily “carries the mantle of the Office of the President in
    this case.” Maj. Op. 24; cf. In re Lindsey, 
    158 F.3d 1263
    , 1286
    (D.C. Cir. 1998) (Tatel, J., concurring in part and dissenting in
    part) (“Because the Presidency is tied so tightly to the persona
    of its occupant . . . the line between official and personal can
    be both elusive and difficult to discern.”). 5
    The basic contours of the problem are straightforward—
    the Committee’s subpoena seeks information regarding alleged
    unlawful actions of the President. The direct conflict between
    Congress and the President cannot be evaded by treating this as
    an ordinary legislative inquiry involving a subpoena to an
    accounting firm. In pursuit of remedial legislation, the
    Committee may investigate broadly, but this subpoena goes too
    5
    As the Department of Justice points out, it is also possible that
    judicial resolution would not be necessary if the Committee had
    issued the subpoena to the President directly. DOJ Br. 7–8. Instead,
    the President and the House would negotiate in the “hurly-burly, the
    give and take of the political process between the legislative and the
    executive,” likely raising a mix of legal and political arguments and
    appealing to the public for support. Executive Privilege - Secrecy in
    Government: Hearings Before the Subcomm. on Intergovernmental
    Relations of the S. Comm. on Government Operations, 94th Cong.
    87 (1975) (statement of Antonin Scalia, Assistant Att’y Gen., Office
    of Legal Counsel).
    11
    far because the legislative power cannot target whether the
    President violated the law.
    II.
    The question of whether the House may issue this
    subpoena for a legislative purpose presents a serious conflict
    between Congress and the President. While the question has
    never been squarely addressed by the Supreme Court, Congress
    and the executive branch have regularly confronted similar
    problems. Accordingly, I start at the beginning. The text and
    structure of the Constitution are best read to provide for
    impeachment as the exclusive mechanism for reaching the
    wrongdoing of the President and other impeachable officials.
    The original understanding of Congress’s separate legislative
    and impeachment powers, as well as consistent historical
    practice since the Founding, confirms that congressional
    investigations of the alleged unlawful actions of the President
    cannot be pursued through the legislative power. Cf. NLRB v.
    Noel Canning, 
    573 U.S. 513
    , 524–26 (2014) (“‘[L]ong settled
    and established practice is a consideration of great weight in a
    proper interpretation of constitutional provisions’ regulating
    the relationship between Congress and the President.” (quoting
    The Pocket Veto Case, 
    279 U.S. 655
    , 689 (1929))).
    Targeting an individual officer for suspicions of
    criminality requires proceeding through the impeachment
    power, with its attendant procedural protections and
    accountability. The majority claims to recount a “familiar tale”
    of congressional subpoenas and investigations, Maj. Op. 65;
    however, its story covers only legislative investigations that
    involve no allegations of wrongdoing against an impeachable
    official. The majority’s cursory and selective use of history
    glosses over important distinctions carefully maintained by all
    three branches between Congress’s legislative and judicial
    powers of investigation.
    12
    A.
    The text and structure of the Constitution set out with
    precision the process for Congress to investigate the unlawful
    actions of the President—namely, impeachment by the House
    followed by a trial in the Senate. The distinctions between the
    legislative and judicial powers of Congress are firmly rooted in
    the Constitution and reflect the fundamental differences
    between these powers in our system of government. The
    original meaning confirms that Congress acts in an exceptional
    judicial capacity when exercising impeachment powers.
    Investigating unlawful actions by impeachable officials is
    outside the legislative power because impeachment provides
    the exclusive mechanism for Congress to investigate such
    conduct.
    Congress is vested with limited and enumerated legislative
    powers, and while the power to investigate is not in the text of
    the Constitution, it has long been recognized that Congress may
    investigate and issue subpoenas necessary and proper to the
    exercise of the legislative power. U.S. CONST. art. I, § 8, cl. 18.
    As the Court has explained, “the power of inquiry—with
    process to enforce it—is an essential and appropriate auxiliary
    to the legislative function.” 
    McGrain, 273 U.S. at 174
    . Such
    investigations are part of the legislative power and may extend
    no farther than that power permits. See 
    Quinn, 349 U.S. at 161
    .
    In the United States, however, the legislative power does
    not include the exercise of judicial power to determine the guilt
    or innocence of individuals. 6 The Constitution prohibits bills
    6
    By contrast, at the time of the Founding, the British House of
    Commons possessed broad powers to “impeach” not only officials
    but individual citizens, who could be tried by the House of Lords in
    a judicial capacity for any criminal offense. 4 William Blackstone,
    Commentaries *259–61. As such, Parliament could not only remove
    13
    of attainder. U.S. CONST. art. I, § 9, cl. 3; art. I, § 10, cl. 1; see
    also United States v. Brown, 
    381 U.S. 437
    , 442 (1965) (“[T]he
    Bill of Attainder Clause was intended not as a narrow, technical
    . . . prohibition, but rather as an implementation of the
    separation of powers, a general safeguard against legislative
    exercise of the judicial function, or more simply—trial by
    legislature.”). The Framers understood the importance of
    prohibiting Congress from turning its substantial powers
    against an individual and possessed a “sense of a sharp
    necessity to separate the legislative from the judicial power.”
    Plaut v. Spendthrift Farm, Inc., 
    514 U.S. 211
    , 219 (1995); see
    also Calder v. Bull, 3 U.S. (3 Dall.) 386, 389 (1798) (reviewing
    parliamentary abuses of bills of attainder and noting “the
    Federal and State Legislatures, were prohibited from passing
    any bill of attainder; or any ex post facto law” to prevent “acts
    of violence and injustice” against individuals). As
    Montesquieu warned, if the judicial powers were “joined with
    the legislative, the life and liberty of the subject would be
    exposed to arbitrary control; for the judge would then be the
    legislator.” Montesquieu, The Spirit of the Laws 157 (A.
    Cohler et al. eds., 1989).
    Vested with the power to make the laws, Congress cannot
    also execute and adjudicate them. See Fletcher v. Peck, 10 U.S.
    (6 Cranch) 87, 136 (1810) (“It is the peculiar province of the
    legislature to prescribe general rules for the government of
    society; the application of those rules to individuals in society
    an official but also assess a broad range of punishments at the
    discretion of “the wisdom of the peers.” 
    Id. at *121–22.
    Against the
    abuses of this practice, the Founders limited the scope of
    impeachable offenses and punishments for conviction. See Peter
    Hoffer & N.E.H. Hull, Impeachment in America, 1635-1805, at 96–
    98 (1984); see also Akhil R. Amar, America’s Constitution: A
    Biography 199–203 (2005) (describing how the “system of federal
    impeachment broke decisively with English impeachment practice”).
    14
    would seem to be the duty of other departments.”). Exercising
    the legislative power, Congress may enact general, prospective
    rules for the whole of society. Yet Congress cannot prosecute
    and decide specific cases against individuals. Such powers
    properly belong to the executive branch and the independent
    judiciary—a division essential to maintaining fundamental
    aspects of our separation of powers and protecting the rights of
    individuals accused of illegal actions.
    As an exception to this separation, the Constitution confers
    upon the House and Senate limited judicial powers over
    impeachable officials. The Constitution vests the House of
    Representatives with the “sole Power of Impeachment,” U.S.
    CONST. art. I, § 2, cl. 5, and the Senate with the “sole Power to
    try all Impeachments,” U.S. CONST. art. I, § 3, cl. 6. The
    Constitution creates a two-tier system, dividing limited judicial
    power between the House and the Senate to target individual
    cases of wrongdoing by impeachable officials. These judicial
    powers were understood as exceptions to the legislative power
    vested in Congress. See 
    Kilbourn, 103 U.S. at 190
    –91 (noting
    impeachment and removal as exceptions to the separation of
    powers because they place judicial power in Congress);
    Hayburn’s Case, 2 U.S. (2 Dall.) 408, 410 (1792) (“[N]o
    judicial power of any kind appears to be vested [in the
    legislature], but the important one relative to impeachments.”).
    In the context of an impeachment inquiry, the House
    serves as a kind of grand jury, investigating public officials for
    misconduct. As Hamilton noted, the “delicacy and magnitude
    of [this] trust” transforms the House into a “NATIONAL
    INQUEST.” The Federalist No. 65, at 338. The Senate acts as
    a “court for the trial of impeachments,” exercising the “awful
    discretion which a court of impeachments must necessarily
    have, to doom to honour or to infamy the most confidential and
    the most distinguished characters of the community.” 
    Id. at 339.
    Trial by the Senate in cases of impeachment is part of the
    15
    “judicial character of the Senate.” 
    Id. at 337;
    see also
    Jefferson’s Manual of Parliamentary Practice § 619 (“The trial,
    though it varies in external ceremony, yet differs not in
    essentials from criminal prosecutions before inferior courts.”).
    The Constitution requires senators trying an impeachment to
    be on “Oath or Affirmation” and for the Chief Justice to preside
    when the President is tried; conviction requires “two thirds of
    the Members present.” U.S. CONST. art. I, § 3, cl. 6. The
    Constitution refers to “Judgment in Cases of Impeachment.”
    U.S. CONST. art. I, § 3, cl. 7.
    As an exercise of judicial power, the impeachment process
    targets the individual. The Constitution’s text confirms this
    understanding: “no Person shall be convicted,” and “the Party
    convicted” shall be liable according to the law. U.S. CONST. art.
    I, § 3, cls. 6–7. “The President, Vice President, and all civil
    Officers of the United States” are subject to impeachment. U.S.
    CONST. art. II, § 4. Article I makes clear that in this role, the
    Senate acts as a court trying impeachable offenses and renders
    judgment that could result in removal from office and
    disqualification from holding any “Office of honor, Trust, or
    Profit under the United States.” U.S. CONST. art. I, § 3, cl. 6.
    The impeachable offenses enumerated in the Constitution
    specifically target individual wrongdoing, namely “Treason,
    Bribery, or other high Crimes and Misdemeanors.” U.S.
    CONST. art. II, § 4; see also The Federalist No. 65, at 339
    (observing the Senate was the only body with “confidence
    enough in its own situation, to preserve, unawed and
    uninfluenced, the necessary impartiality between an individual
    accused, and the representatives of the people, his accusers”).
    The Founders treated impeachable offenses as wholly
    distinct from the subjects of investigation for legislative
    purposes, such as maladministration. The exact phrasing of an
    impeachable offense was debated at the Philadelphia
    Convention. After the Convention settled on “Treason, or
    16
    bribery,” George Mason moved to include “maladministration”
    as an additional ground for impeachment. 2 Records of the
    Federal Convention 550 (Max Farrand ed., 1937). James
    Madison objected, arguing that “[s]o vague a term will be
    equivalent to a tenure during pleasure of the Senate,” and
    Gouverneur Morris argued that “[a]n election of every four
    years will prevent maladministration.” 
    Id. Conceding the
    point,
    Mason withdrew “maladministration” and submitted the text
    eventually enacted: “other high crimes & misdemeanors.” 
    Id. Thus, impeachment
    addresses a public official’s wrongdoing—
    treason, bribery, and high crimes or misdemeanors—while
    problems of general maladministration are left to the political
    process.
    In addition, impeachment by the House and trial by the
    Senate were understood to include constitutional rights
    normally afforded to the accused in a criminal trial. After
    examining English, colonial, and early constitutional practice,
    Justice Story concluded that the common law rights of criminal
    defendants apply in the exercise of the impeachment power.
    See 3 Joseph Story, Commentaries on the Constitution of the
    United States § 796 (1833) (“[I]n trials by impeachment the law
    differs not in essentials from criminal prosecutions before
    inferior courts. The same rules of evidence, the same legal
    notions of crimes and punishments prevail.”); see also 3 Asher
    C. Hinds, Hinds’ Precedents of the House of Representatives
    § 2486 (“Hinds”) (“In the prosecution of an impeachment, such
    rules must be observed as are essential to justice; and, if not
    exactly the same as those which are practiced in ordinary
    courts, they must be analogous, and as nearly similar to them
    as forms will permit.” (quoting Op. Att’y Gen. of May 9,
    1796)).
    The Supreme Court has long recognized the enhanced
    protections required by impeachment’s judicial function, even
    if such matters are generally not justiciable. See Nixon v.
    17
    United States, 
    506 U.S. 224
    , 238 (1993) (concluding that
    judicial review of impeachment procedures would be
    inconsistent with the text and structure of the Constitution);
    Marshall v. Gordon, 
    243 U.S. 521
    , 547 (1917) (noting that
    when the congressional contempt power is “transformed into
    judicial authority” as when a “committee contemplate[es]
    impeachment,” the authority becomes “subject to all the
    restrictions and limitations imposed by the Constitution”);
    
    Kilbourn, 103 U.S. at 190
    (impeachment proceedings assume
    “the same manner” and employ the “same means that courts of
    justice can in like cases”).
    Moreover,      impeachment       and    removal     ensure
    accountability to Congress but are not designed to give
    Congress direct control over the executive branch. The
    President is the head of a co-equal and independent branch of
    government. The impeachment power raised concerns for
    Gouverneur Morris and other Framers who feared “the
    prospect of impeachment would make the chief executive
    dependent upon the legislature.” Peter Hoffer & N.E.H. Hull,
    Impeachment in America, 1635-1805, at 100 (1984); see also
    The Federalist No. 65, at 341 (noting the risk of “persecution
    of an intemperate or designing majority in the House of
    Representatives”).
    Because of the weighty responsibility of investigating and
    trying public officers, “the Constitution structured
    impeachment as a system of national accountability.” Akhil R.
    Amar, America’s Constitution: A Biography 201 (2005). The
    Framers established a mechanism for Congress to hold even the
    highest officials accountable, but also required the House to
    take responsibility for invoking this power. See 3 Annals of
    Cong. 903 (1793) (statement of Rep. Smith) (describing the
    “solemnities and guards” the impeachment process offers to
    public officers “accused of a breach of duty”); H.R. Rep. No.
    93-1305, at 182 (1974) (describing the House’s “responsibility
    18
    as representatives of the people” in the Nixon impeachment
    process). By vesting this visible and solemn power in one
    institution, the Constitution forces the House to take
    accountability for its actions when investigating the President’s
    misconduct. See Michael J. Gerhardt, The Federal
    Impeachment Process: A Constitutional and Historical
    Analysis 110 (1996) (“[M]embers of Congress seeking
    reelection have a political incentive to avoid any abuse of the
    impeachment power. . . . [T]he cumbersome nature of the
    impeachment process makes it difficult for a faction guided by
    base personal or partisan motives to impeach and remove
    someone from office.”); Julie R. O’Sullivan, The Interaction
    Between Impeachment and the Independent Counsel Statute,
    86 GEO. L.J. 2193, 2229–30 (1998) (“[E]lectoral accountability
    is the ultimate check by which Congress’s abuse of its
    otherwise externally unchecked power of impeachment may be
    constrained.”).
    In light of the text, structure, and original meaning, the
    Constitution is best read to provide for impeachment as the
    exclusive mechanism for Congress to investigate the
    wrongdoing of the President and other impeachable officials.
    See Kendall v. United States ex rel. Stokes, 37 U.S. (12 Pet.)
    524, 610 (1838) (“The executive power is vested in a President;
    and as far as his powers are derived from the constitution, he is
    beyond the reach of any other department, except in the mode
    prescribed by the constitution through the impeaching
    power.”). It would be wholly inconsistent with this exacting
    structure and its explicit safeguards if Congress could target
    unlawful actions by impeachable officials simply through its
    legislative power, thereby encroaching on the Executive
    without the processes, protections, and accountability of
    impeachment.
    B.
    19
    Because “the interpretive questions before us concern the
    allocation of power between two elected branches of
    Government,” Noel 
    Canning, 573 U.S. at 524
    , I proceed to
    consider the historical practice regarding congressional
    investigations of the executive branch and executive officials.
    Cf. 
    Zivotofsky, 135 S. Ct. at 2084
    (“To determine whether the
    President possesses the exclusive power of recognition the
    Court examines the Constitution’s text and structure, as well as
    precedent and history bearing on the question.”). While
    historical practice is relevant, it does not alter the original
    meaning of the Constitution. See McIntyre v. Ohio Elections
    Comm’n, 
    514 U.S. 334
    , 370 (1995) (Thomas, J., concurring in
    the judgment) (recognizing the concern with overturning
    longstanding state practice, but concluding that “the historical
    evidence from the framing outweighs recent tradition”).
    With respect to Congress’s investigative powers, the
    original meaning and historical practice align—all three
    branches      have     consistently   distinguished    between
    investigations for legislative purposes and investigations
    targeting wrongdoing by an impeachable official. Moreover,
    the historical evidence demonstrates that Congress often begins
    an investigation into the executive branch with general
    questions properly pertaining to legislation; however, if an
    inquiry turns to suspicions of criminality, Congress moves that
    part of the investigation into impeachment or ends the inquiry
    into the impeachable official. Thus, even a valid legislative
    purpose has never been thought to justify probing specific
    accusations of wrongdoing by impeachable officials.
    Exercising their independent duty to interpret the Constitution,
    the political branches have maintained that impeachment is the
    exclusive mechanism for investigating impeachable offenses.
    This historical practice reflects and reinforces the
    Constitution’s text, structure, and original meaning, and is
    consistent with the Supreme Court’s precedents.
    20
    1.
    Founding Era practice confirms the Constitution’s original
    meaning—investigations of unlawful actions by an
    impeachable official cannot proceed through the legislative
    power. For instance, in 1793 the House passed a broad
    resolution to investigate the administration of the Department
    of the Treasury. See 3 Annals of Cong. 835–40 (1793).
    Representative William Giles subsequently introduced a string
    of resolutions alleging wrongdoing and lawbreaking by
    Secretary Alexander Hamilton. 
    Id. at 900
    (alleging, inter alia,
    “[t]hat the Secretary of the Treasury has violated the law”).
    Responding       to    Representative      Giles’s    resolution,
    Representative William Smith argued that an investigation of
    whether “the Secretary violated a law” could not proceed under
    the guise of “an investigation of theoretic principles of
    Government.” 
    Id. at 901.
    Instead, the Constitution “directs”
    that Congress must confront “great public functionaries . . .
    accused of a breach of duty” through the impeachment process,
    with its attendant “solemnities and guards.” 
    Id. at 903;
    see also
    
    id. at 903–04
    (statement of Rep. Murray); 
    id. at 94
    7–48
    (statement of Rep. Boudinot) (“[The Committee] were no
    longer acting in a Legislative capacity, but were now exercising
    the important office of the grand inquest of the Nation . . . . The
    honor and reputation of the officer thus charged . . . required a
    steady, uniform, and disinterested examination of every
    question from us.”). Representative Giles’s resolutions were
    decisively defeated. See 
    id. at 955–63.
        Similarly, in 1796 the House requested from President
    George      Washington      documents      and      diplomatic
    correspondence related to the Jay Treaty and its ratification in
    order to determine whether to appropriate the funds necessary
    to implement the Treaty. President Washington argued that
    because the House could not compel him to disclose the
    documents through an exercise of its legislative powers, it
    21
    could demand the documents only through an exercise of its
    impeachment power: “It does not occur that the inspection of
    the papers asked for can be relative to any purpose under the
    cognizance of the House of Representatives, except that of an
    impeachment; which the resolution has not expressed.” See 5
    Annals of Cong. 760–62 (1796). The House passed a resolution
    disapproving of President Washington’s message, but
    eventually appropriated the funds necessary to implement the
    Treaty without receiving the papers it demanded from the
    President. See 
    id. at 1291.
         Moreover, during the early years of the Republic, when the
    House sought to target individual, official misconduct, it
    proceeded through the impeachment power, not the legislative
    power. In the high profile 1805 impeachment of Associate
    Justice Samuel Chase, the investigation into his misconduct
    proceeded unambiguously under the impeachment power. See
    3 Hinds §§ 2342–46. The House specifically defined its role as
    that of a grand jury and voted to authorize an impeachment
    investigation by a committee vested with subpoena powers. See
    
    id. § 2342.
    7
    One early impeachment illustrates the line between
    general investigation and impeachment particularly well.
    During an investigation of the “disposition of the funds of the
    district court,” “the conduct of the judge of the district had been
    somewhat implicated.” 32 Annals of Cong. 1715–16 (1818)
    (discussing Judge William P. Van Ness of the Southern District
    of New York). The Judiciary Committee thought it improper to
    7
    Congress conducted such investigations exclusively through the
    impeachment power throughout the Founding Era. See 3 Hinds
    §§ 2294–2302 (impeachment of Senator William Blount, 1797);
    §§ 2319–23 (impeachment of Judge John Pickering, 1803); §§ 2364–
    67 (impeachment of Judge James Peck, 1830, highlighting the
    importance of protections for the accused before the Senate trial).
    22
    proceed under the existing resolution and sought specific
    authority from the House to transfer from a legislative
    investigation to an investigation of the judge’s “official
    conduct.” 
    Id. After such
    authority was granted, the Committee
    conducted an impeachment inquiry and found no “ground for
    the constitutional interposition of the House.” 3 Hinds § 2489.
    Ignoring these Founding Era precedents, the majority
    touches briefly on investigations for legislative purposes that
    concerned only general maladministration. None of the
    majority’s examples involve an allegation of individual
    wrongdoing or unlawful activity by an impeachable officer.
    Indeed, the majority’s examples help to demonstrate the
    original understanding that such investigations proceed
    exclusively through the impeachment power.
    The majority begins with the House’s 1792 investigation
    into the failure of the expedition under General Arthur St. Clair
    in the Northwestern Territory. Maj. Op. 11. This investigation
    did not single out any particular officer for misconduct; instead,
    it was a general investigation into “the causes of the late defeat
    of the army under the command of Major-General St. Clair”
    and associated problems of logistics and supply. 3 Hinds
    § 1725. The investigation did not focus on General St. Clair,
    who was in any event not an impeachable officer because the
    impeachment power extends only to “civil Officers.” U.S.
    CONST. art. II, § 4. Rather, the House sought to study the
    problems of execution in the expedition as a whole.
    Furthermore, at the Washington Administration’s urging,
    Congress amended its resolution of inquiry to disclaim any
    intention of seeking private papers. See Thomas Jefferson,
    Memoranda of Consultations with the President (11 Mar. to 9
    Apr. 1792); 3 Hinds § 1726 (calling for papers only “of a public
    nature”). Contrast this general investigation with the
    investigation of Secretary Hamilton: when the inquiry began to
    focus on whether Hamilton had violated the law, the House
    23
    insisted such inquiries could not proceed through the ongoing
    legislative investigation. The investigation of the St. Clair
    expedition never turned toward an impeachable official, and
    therefore remained within Congress’s legislative powers. See 3
    Annals of Cong. 490–94 (1792).
    Similarly, the majority’s reference to Congress’s
    investigation of the burning of Washington in 1814 offers a
    useful example of the line maintained throughout the Founding
    Era between general investigation and impeachment. Maj. Op.
    12. This legislative investigation focused on the general causes
    of the military disaster without targeting any individual officer.
    See Herman J. Viola, “The Burning of Washington, 1814,” in
    Congress Investigates: A Critical and Documentary History
    41–45 (Roger A. Bruns et al. eds., 2011). The majority’s
    Founding Era precedents thus buttress the rule that
    investigations into the causes of maladministration may
    proceed under the legislative power; however, the legislative
    power cannot support an investigation into whether an
    impeachable official has violated the laws. Such congressional
    inquiry must proceed, if at all, through the impeachment
    process.
    2.
    The Founding Era practice continued into the Jacksonian
    Era. For example, in 1832, Representative John Quincy Adams
    defeated a resolution seeking to conduct a legislative
    investigation into charges of public misconduct against a
    federal land commissioner. The matter was referred to the
    House Judiciary Committee after Adams argued that “[t]he
    resolution contained a matter of charge against a public officer.
    Prima facie it would lead to an expectation of an impeachment.
    It was alike due to the character of the officer in question, and
    to the reputation of the House, to investigate the matter
    solemnly and effectually.” 8 Reg. Deb. 2198–99 (1832).
    24
    In 1836, the House appointed a select committee to
    conduct a broad investigation of all departments of the Jackson
    Administration, empowering the committee to call for persons
    and papers. 3 Hinds § 1737. When the Committee’s
    investigation focused on particular officials, President Andrew
    Jackson intervened in protest of the Committee’s “illegal and
    unconstitutional calls for information.” 
    Id. The President
    argued that he would fully cooperate with an investigation
    conducted “in the accustomed mode,” impeachment, but would
    not subject himself to “the establishment of a Spanish
    inquisition.” Letter from President Andrew Jackson to Rep.
    Henry A. Wise, Chairman, H. Select Comm. (Jan. 26, 1837).
    Chairman Wise resisted and submitted a resolution disagreeing
    with the doctrine expounded by the President, providing a rare
    contrary understanding of the scope of the legislative power to
    investigate. But the Chairman’s position was soundly defeated
    by his committee, which issued a report endorsing President
    Jackson’s position and noting that the investigation amounted
    to charges “against the individual officers for ‘corrupt
    violation’ of existing laws.” 3 Hinds § 1740. The Committee
    further concluded that “the only constitutional power under
    which the House of Representatives, as a coordinate branch of
    the Government, could constitute a committee to inquire into
    alleged ‘corrupt violations of duty’ by another coordinate
    branch of the Government (the Executive) is the ‘power of
    impeachment.’” 
    Id. Indeed, Congress
    reaffirmed that it could not censure
    President Jackson outside the context of impeachment. After
    initially voting to censure, the Senate later expunged the
    censure from the record on the grounds that “President Jackson
    was adjudged and pronounced to be guilty of an impeachable
    offence, and a stigma placed upon him, as a violator of his oath
    of office, and of the laws and constitution which he was sworn
    to preserve, protect, and defend, without going through the
    forms of an impeachment, and without allowing him the
    25
    benefits of a trial, or the means of defence.” 12 Reg. Deb. 878
    (1836). 8
    Presidents James Polk, Ulysses Grant, and Grover
    Cleveland continued to vigorously defend the line between
    legislative and impeachment investigations, maintaining the
    latter included legal protections for the officer accused. In
    1846, the House formed a select committee to investigate the
    possibility of impeaching Daniel Webster, the former Secretary
    of State (and then-Senator), with the power to send for papers.
    Cong. Globe, 29th Cong., 1st Sess. 945 (1846). While the
    Select Committee conducted its investigation, the House
    debated a resolution calling for the State Department to
    produce documents tending to incriminate Webster. 
    Id. at 636.
    Some members argued that only the duly authorized Select
    Committee could make such a request. 
    Id. at 636–43.
    Representative Adams maintained that an impeachable official
    “may not be reached by side-blows.” 
    Id. at 641.
    The resolution
    passed, but President Polk refused to turn over the requested
    documents because the resolution did not clearly spell out
    8
    The majority asserts that “Presidents, too, have often been the
    subject of Congress’s legislative investigations.” Maj. Op. 15. Its one
    example from the Jacksonian Era, however, fails to support its
    conclusion. The majority refers to the select committee appointed to
    investigate former Representative Samuel Houston and whether he
    received money from the Secretary of War with the President’s
    knowledge. 
    Id. at 15–16.
    Far from an investigation of the President’s
    wrongdoing, this inquiry was part of a broader investigation of
    Houston’s assault on a member of Congress for statements made on
    the floor. The Committee Report never mentions the President, nor
    does it indicate the Committee took any steps to investigate the
    President. See 2 Hinds §§ 1616–19; 8 Reg. Deb. 2591–92 (1832)
    (context of inquiry); 
    id. at 2595
    (then-Rep. Polk proposing inquiry);
    
    id. at 2853
    (need for resolution was to determine veracity of
    statement made on floor that provoked Houston’s attack); 
    id. at 3022–33
    (resolution forming select committee).
    26
    Congress’s intent to obtain the documents pursuant to its
    impeachment power.
    President Polk emphasized, however, that he would fully
    cooperate with a duly authorized impeachment investigation.
    See 2 Hinds § 1561 (“[T]he power of impeachment belongs to
    the House of Representatives, and that with a view to the
    exercise of this power, that House has the right to investigate
    the conduct of all public officers under the government.”
    (quoting President James K. Polk, Message to the House of
    Representatives, April 20, 1846)). The Select Committee
    “entirely concur[red] with the President of the United States”
    and his decision not to “communicate or make public, except
    with a view to an impeachment” the document sought. Cong.
    Globe, 29th Cong. 1st Sess. 946–48, 988 (1846); see also H.R.
    Rep. No. 29-684, at 4 (1846). The House approved the Select
    Committee’s proposal and took no further action on the matter.
    See 2 George Ticknor Curtis, The Life of Daniel Webster 283
    (1870). President Polk and the House agreed that the House
    may call for documents seeking evidence of a public officer’s
    wrongdoing only pursuant to an impeachment investigation. 9
    This issue was raised again by the 1860 House Select
    Committee to Investigate Alleged Corruptions in Government
    (“Covode Committee”) when it investigated “whether the
    President of the United States, or any other officer of the
    Government, has, by money, patronage, or other improper
    means, sought to influence the action of Congress.”
    9
    Presidents adhered to this position throughout the Nineteenth
    Century without pushback from Congress. See, e.g., 17 Cong. Rec.
    1903 (1886) (statement of President Cleveland) (“I am also led
    unequivocally to dispute the right of the Senate, by the aid of any
    documents whatever, or in any way save through the judicial process
    of trial on impeachment, to review or reverse the acts of the
    Executive in the suspension . . . of Federal officials.”).
    27
    2 Hinds § 1596. President Buchanan protested the attempt to
    circumvent the impeachment process, noting that while the
    House has the “wholesome prerogative” of examining
    administration of the departments of the government:
    Should [the House] find reason to believe in the
    course of their examinations that any grave
    offense had been committed by the
    President . . . rendering it proper, in their
    judgment, to resort to impeachment, their
    course would be plain. They would then transfer
    the question from their legislative to their
    accusatory jurisdiction, and take care that . . .
    the accused should enjoy the benefit of cross-
    examining the witnesses and all the other
    safeguards with which the Constitution
    surrounds every American citizen.
    President James Buchanan, Addendum to March 28 Message
    to Congress (June 22, 1860). The House asserted its power to
    investigate generally, but issued no subpoena seeking evidence
    of unlawful conduct by the President. See 2 Hinds § 1596; 3
    Hinds § 1683.
    Even the Civil War and Reconstruction Congresses, which
    strongly asserted congressional power, adhered to the
    distinction between investigations for legislative purposes and
    investigations of illegal conduct by an impeachable official.
    For example, the Joint Committee on the Conduct of the War
    harangued non-impeachable military officers and articulated
    broad theories of congressional power, but never issued
    compulsory process to the President or sought to determine if
    particular civil officers violated the law. See generally
    Elizabeth Joan Doyle, “The Conduct of the Civil War, 1861–
    65” in Congress Investigates at 160–89. The majority’s
    reference to the Harpers Ferry investigation, Maj. Op. 12,
    similarly misses the mark because that investigation never
    28
    focused on the unlawful conduct of an impeachable official, but
    instead sought facts about the raid generally in order to
    determine whether legislation was necessary. See Roger A.
    Bruns, “John Brown’s Raid on Harpers Ferry, 1859–60” in
    Congress Investigates at 127–28.
    The impeachment of President Andrew Johnson
    demonstrates the strength of the rule against using legislative
    inquiries to circumvent the impeachment process. The House
    rebuffed early attempts to initiate an inquiry into President
    Johnson’s wrongdoing under the auspices of an investigation
    into the executive branch’s administration. See Michael Les
    Benedict, “The Impeachment of President Andrew Johnson,
    1867–68” in Congress Investigates at 263–64. While a
    minority of representatives would have favored using the
    legislative power to address President Johnson’s abuses, “the
    tedious job of taking testimony and searching through
    documents” did not begin until after a formal impeachment
    process was initiated. Id.; see also 3 Hinds §§ 2399–2400.
    President Grant maintained the line against aggressive
    congressional requests in the midst of Reconstruction. The
    House requested detailed information regarding President
    Grant’s whereabouts while performing executive functions to
    determine whether the President was in violation of the Act of
    16 July 1790, which established the District of Columbia as the
    seat of government. See 3 Hinds § 1889. President Grant
    refused to comply with the request on separation of powers
    grounds. See 4 Cong. Rec. 2999–3000 (1876). As he explained,
    the investigation did not “belong to the province of legislation,”
    nor did it bear on any impeachment proceeding. 
    Id. He therefore
    felt obliged under the Constitution to refuse the
    request in order to prevent “encroachments upon the proper
    powers of the office which the people of the United States have
    confided to me.” Id.; see also 3 Hinds § 1889 (“What the House
    of Representatives may require as a right in its demand upon
    29
    the Executive for information is limited to what is necessary
    for the proper discharge of its powers of legislation or of
    impeachment.”). The House took no further action. See 3
    Hinds § 1889.
    In the 1879 investigation of United States Consul George
    Seward, the House again reaffirmed the separation between
    legislative and impeachment investigations. Acting under its
    legislative authority, the House Committee on Expenditures in
    the State Department attempted to hold Seward in contempt for
    failing to comply with a subpoena seeking certain official
    papers. 
    Id. § 1699.
    Seward argued that the Committee was not
    authorized to conduct an impeachment inquiry and could not
    investigate his alleged misconduct pursuant to the legislative
    power. Agreeing with Seward, the House referred the matter to
    the Judiciary Committee. 
    Id. The Judiciary
    Committee’s report
    “distinguished[ed] this case from the case of an ordinary
    investigation for legislative purposes,” and held that the
    Committee on Expenditures had acted beyond its legislative
    powers by attempting to circumvent the protections of the
    impeachment process:
    The Executive is as independent of either House
    of Congress as either House of Congress is
    independent of him, and they cannot call for the
    records of his action or the action of his officers
    against his consent, any more than he can call
    for any of the journals or records of the House
    or Senate.
    
    Id. §§ 1700,
    2514. The Judiciary Committee maintained that
    the House had no right to issue compulsory process against the
    executive branch outside the impeachment process. 10
    10
    The Judiciary Committee recognized that Seward could not be
    compelled to produce either private or public papers. His private
    30
    3.
    Continuing into the Twentieth Century, presidents have
    been vigilant against congressional attempts to circumvent the
    impeachment process. In 1909, the Senate attempted to
    subpoena documents from the Attorney General regarding the
    Department of Justice’s failure to act against U.S. Steel
    Corporation. President Theodore Roosevelt refused to comply,
    so the Senate subpoenaed the Commissioner of Corporations,
    an officer within the Department of Commerce and Labor, for
    the same documents. See Commissioner of Corporations—
    Right of Senate Committee to Ask for Information, 27 Op. Att’y
    Gen. 150 (1909). After ordering the Commissioner to withhold
    the documents, the President informed the Senate that he would
    turn over the documents only if the Senate was acting in its
    capacity as an impeachment court. See History of Refusals by
    Executive Branch Officials to Provide Information Demanded
    by Congress, 
    6 Op. O.L.C. 751
    , 769 (1982) (citing Edward S.
    Corwin, The President: Office and Powers 429–30 (1957)).
    The Senate took no further action. 11
    Investigations of Secretary of the Treasury Andrew
    Mellon similarly demonstrate the executive branch’s resistance
    papers were protected by the right against self-incrimination and his
    title to his private property, which could not be collaterally stripped
    by Congress. As for public papers, the Committee recognized them
    as within the province of executive privilege. 3 Hinds §§ 1700, 2514.
    11
    President Roosevelt’s handling of the matter was recorded by his
    personal aide: “I told [Senator Clark] that the Senate should not have
    those papers and that [the Commissioner] turned them over to me.
    The only way the Senate or the committee can get those papers now
    is through my impeachment.” Archibald Willingham Butt &
    Lawrence F. Abbott, The Letters of Archie Butt, Personal Aide to
    President Roosevelt 305–06 (1924).
    31
    to releasing documents demanded for legislative purposes in
    relation to an impeachable official’s wrongdoing. In 1925,
    President Calvin Coolidge refused to hand over Mellon’s tax
    returns to a Senate committee tasked with a legislative
    investigation of the Bureau of Internal Revenue, noting that
    “the attack which is being made on the Treasury Department
    goes beyond any . . . legitimate requirements.” 65 Cong. Rec.
    6087–88 (1924). 12 In 1929, the Senate Judiciary Committee
    investigated Mellon’s alleged violations of financial conflicts
    of interest laws. The Committee determined it did not have the
    power to issue compulsory process because “it would be a
    judicial inquiry and [] not in aid of any legislative function of
    the Senate” and could be reached only through “duly instated
    criminal proceedings or impeachment proceedings originating
    in the House of Representatives.” S. Rep. No. 71-7, at 3 (1929).
    In 1932, the House Judiciary Committee was authorized to
    conduct a formal impeachment investigation, with subpoena
    power, into the same allegations of Mellon’s alleged
    lawbreaking. 3 Deschler’s Precedents, Ch. 14, § 14.1
    (“Deschler”). 13
    12
    Congress did not attempt to enforce the subpoena in court but
    instead engaged in negotiations with the executive branch, which
    resulted in a compromise and Congress passing legislation regarding
    the disclosure of tax returns. See George K. Yin, James Couzens,
    Andrew Mellon, the ‘Greatest Tax Suit in the History of the World,’
    and Creation of the Joint Committee on Taxation and Its Staff, 66
    TAX L. REV. 787, 857 (2013).
    13
    The majority’s citation to the Pearl Harbor investigation, Maj. Op.
    16, is of limited value, as President Franklin Roosevelt passed away
    on April 12, 1945, nearly five months before Congress authorized
    the investigation on September 6, 1945, placing the former President
    beyond the reach of Congress’s subpoena power. See Wayne
    Thompson, “The Pearl Harbor Committee, 1945–46” in Congress
    Investigates at 670.
    32
    4.
    In the modern era, Congress has investigated allegations
    of illegal conduct by Presidents Richard Nixon, Ronald
    Reagan, and Bill Clinton. The majority cites these as examples
    of presidents being “the subject of Congress’s legislative
    investigations.” Maj. Op. 16–18. Contrary to the majority’s
    characterization, these investigations reinforce that Congress
    may launch legislative investigations into administration
    generally, including the President’s involvement in
    discretionary decisionmaking and purported scandals, but
    when wrongdoing by the President is targeted or uncovered the
    House transfers allegations of such conduct to an impeachment
    inquiry.
    For example, the congressional inquiry into the break-in at
    the Democratic National Committee’s headquarters in the
    Watergate Hotel began with the creation of a Senate Select
    Committee to investigate the incident and determine whether
    new legislation on electoral safeguards might be needed. See
    S. Res. 60, 93d Cong. § 1(a) (1973). The inquiry centered on
    whether any actions—“illegal, improper, or unethical”—took
    place, but the inquiry did not target any specific persons. 
    Id. President Nixon
    initially rebuffed the Select Committee’s
    informal requests for information. See Letter from President
    Richard M. Nixon to Sen. Sam J. Ervin Jr., Chairman, Sen.
    Select Comm. on Presidential Campaign Activities (July 6,
    1973). The Committee, acting pursuant to its legislative power,
    later issued two subpoenas to the President. Those subpoenas
    were eventually quashed by this court. See Senate 
    Select, 498 F.2d at 733
    . 14
    14
    When the Supreme Court upheld the grand jury request for
    President Nixon’s tapes, it specifically confined its decision to the
    context of criminal investigations and noted it was not concerned
    33
    While litigation was pending, the House Judiciary
    Committee determined that the evidence gathered through both
    the Senate and special counsel investigations had shifted the
    focus so heavily toward allegations of wrongdoing by President
    Nixon that a formal impeachment investigation was necessary
    to proceed any further:
    We have reached the point when it is important
    that the House explicitly confirm our
    responsibility under the Constitution.
    We are asking the House of Representatives, by
    this resolution, to authorize and direct the
    Committee on the Judiciary to investigate the
    conduct of the President of the United States, to
    determine whether or not evidence exists that
    the President is responsible for any acts that in
    the contemplation of the Constitution are
    grounds for impeachment . . . .
    [W]e are asking the House to give the Judiciary
    Committee the power of subpoena in its
    investigations. Such a resolution has always
    been passed by the House. . . . It is a necessary
    step if we are to meet our obligations.
    3 Deschler Ch. 14, § 6.2. Only after the House passed a
    resolution explicitly invoking its authority under the
    impeachment power did the Judiciary Committee subpoena the
    President. See H.R. Res. 803, 93d Cong. (1974); H.R. Rep. No.
    93-1305, at 6 (1974).
    The House Judiciary Committee took responsibility for
    commencing an impeachment investigation and thereafter
    with how these issues might be resolved in the context of
    “congressional demands for information.” United States v. Nixon,
    
    418 U.S. 683
    , 712 n.19 (1974).
    34
    accorded robust procedural protections to ensure that
    documents obtained in the course of that process remained
    confidential. H.R. Rep. No. 93-1305, at 8–9. The Committee
    also determined that the President must comply only with
    subpoenas issued “relative to the impeachment inquiry.” 3
    Deschler Ch. 14, § 6.12. Notably, one of the grounds in the
    resulting articles of impeachment was President Nixon’s
    failure to comply with subpoenas, but only those issued after
    formal authorization of the impeachment investigation. 
    Id. § 15.13.
    The majority neglects this institutional history and
    focuses only on the Select Committee’s unsuccessful attempt
    to subpoena the President for legislative purposes. Maj. Op.
    17–18. In the 1970s, as in the 1790s, the House recognized the
    importance of invoking the impeachment power when an
    investigation shifts from a legislative inquiry to an
    investigation of the illegal action of an impeachable official.
    Regarding the Iran-Contra Affair in 1987, the majority
    asserts that the House committee established to inquire into
    illegal arms sales to Iran to finance Nicaraguan rebels sought
    to “investigate . . . the role of the President” in those events. 
    Id. at 16.
    This misrepresents the broad scope of the investigation,
    which inquired into whether and how the National Security
    Council staff and other agency officials were involved. The
    House resolution forming the Select Committee to Investigate
    Covert Arms Transactions with Iran refers to the President only
    in relation to assessing the need for legislation regarding
    “authorization and supervision or lack thereof of the matters in
    this section by the President and other White House personnel.”
    H.R. Res. 12, 100th Cong. § 1(e) (1987). The corresponding
    Senate resolution does not mention the President at all. See S.
    Res. 23, 100th Cong. (1987). Reflecting the general focus on
    the process of national security decisionmaking, the joint report
    issued by the House and Senate select committees sought to
    “explain what happened in the Iran-Contra Affair” rather than
    target the actions of any individual official. H.R. Rep. No. 100-
    35
    433, at xv–xvi (1987). The Committees obtained over one
    million pages of documents, in part through subpoenas, but
    only accessed the President’s personal papers through his
    voluntary cooperation.
    Similarly, the majority mischaracterizes the lessons of
    Congress’s investigation of the Whitewater Development
    Corporation and the eventual impeachment trial of President
    Clinton. Congressional involvement began several years after
    a United States Attorney forwarded a criminal investigation of
    the failure of Madison Guaranty Savings and Loan Association
    to the Department of Justice and, ultimately, an independent
    counsel. From 1994 to 1998, various House and Senate
    committees gathered facts on Madison Guaranty’s failure and
    whether agencies and administration officials cooperated with
    the independent counsel. See S. Res. 120, 104th Cong. (1995).
    The committees investigated with a wide lens, but stopped well
    short of targeting offenses by particular officers. See, e.g., S.
    Rep. No. 104-191, at 1–3 (1995). Then-Governor Clinton’s
    involvement in Whitewater was parsed in relation to public
    ethics, good governance, and the regulation of financial
    institutions. See The Failure of Madison Guaranty Savings and
    Loan Association and Related Matters: Hearing Before the H.
    Comm. on Banking and Fin. Servs., 104th Cong. 1–5 (1995)
    (opening statement of Rep. James A. Leach, Chairman)
    (purpose of Whitewater hearings was to “shed light on the
    character of modern political leadership rather than simply
    spotlight flaws in a particular leader; . . . [and] to draw lessons
    for oversight of our banking laws rather than simply critique
    what went wrong with one institution”). While the President
    received subpoenas from the independent counsel, other
    federal investigators, and a federal grand jury, the majority
    points to no examples of either house of Congress issuing a
    subpoena to the President prior to impeachment.
    36
    Once President Clinton’s alleged misconduct became the
    target, the House, citing much of the history discussed above,
    formally invoked the impeachment power. See H.R. Rep. No.
    105-795, at 24 (1998) (“Because impeachment is delegated
    solely to the House of Representatives by the Constitution, the
    full House of Representatives should be involved in critical
    decision making regarding various stages of impeachment.”).
    The House proceeded to a full floor vote to authorize an
    impeachment inquiry. See H.R. Res. 581, 105th Cong. (1998)
    (authorizing the Judiciary Committee to subpoena persons and
    things).
    The House also declined to issue a censure resolution
    because it would circumvent the Impeachment and Bill of
    Attainder Clauses. See H.R. Rep. No. 105-830, at 137 (1998)
    (“[F]or the President or any other civil officer, censure as a
    shaming punishment by the legislature is precluded by the
    Constitution, since the impeachment provisions permit
    Congress only to remove an officer . . . and disqualify him from
    office. Not only would [censure] undermine the separation of
    powers by punishing the President . . . in a manner other than
    expressly provided for in the Constitution, but it would violate
    the Constitution’s prohibition on Bills of Attainder.”).
    ***
    The text, structure, and original meaning of the
    Constitution are best understood to provide for impeachment
    as the exclusive mechanism for Congress to investigate the
    illegal conduct of the President and other impeachable
    officials. The majority presents no evidence from the
    Constitution, our cases, or the consistent interpretation of the
    political branches to refute these conclusions. From the
    Founding to the present, interactions between the political
    branches demonstrate a consistent practice that confirms the
    original meaning regarding the separation of the legislative and
    judicial powers of the House. The Constitution and our history
    37
    reinforce several principles. First, the House cannot investigate
    the illegal conduct of an impeachable officer pursuant to the
    legislative power. Second, the investigation of the illegal
    conduct of an impeachable officer can be pursued only under
    the impeachment power, which transforms the House from a
    legislative body into the grand inquest of the nation and affords
    procedural and constitutional protections to the accused. Third,
    the House may not circumvent the weighty accountability of
    the impeachment process simply by proceeding through a
    legislative investigation.
    III.
    With these constitutional and historical principles as
    guideposts, I reach the question at hand: whether the
    Committee’s subpoena is a valid exercise of the legislative
    power. I examine the subpoena and conclude that it seeks to
    investigate illegal conduct of the President by reconstructing
    past actions in connection with alleged violations of ethics laws
    and the Emoluments Clauses. Such an inquiry exceeds
    Congress’s legislative power. The remedial legislative
    purposes offered by the Committee might authorize any
    number of other investigations, but cannot authorize this
    subpoena, which seeks to determine whether the President
    violated the law. Moreover, this subpoena represents an
    unprecedented assertion of legislative power and is readily
    distinguished from our previous cases. Neither the
    Constitution, nor longstanding interpretation by all three
    branches, supports the majority’s conclusion, which upholds—
    for the first time—a targeted investigation of the President’s
    alleged unlawful conduct under the legislative power.
    A.
    As the above history makes clear, the House’s legislative
    and judicial powers are wholly distinct and the House cannot
    target conduct that could constitute a high crime or
    38
    misdemeanor through the legislative power. Discerning the line
    between the legislative and impeachment powers does not
    require a search for the Committee’s motives because the
    Committee has emphasized repeatedly and candidly its interest
    in investigating allegations of illegal conduct by the President.
    In general, courts properly refrain from questioning legislative
    motive when assessing the legitimacy of congressional
    investigations, accord Maj. Op. 22, but this does not excuse us
    from the judicial duty to assure Congress is acting “in
    pursuance of its constitutional power.” Barenblatt v. United
    States, 
    360 U.S. 109
    , 132 (1959); see also 
    Eastland, 421 U.S. at 508
    –09 (upholding subpoenas “about a subject on which
    legislation may be had”); 
    Watkins, 354 U.S. at 200
    (“[M]otives
    alone would not vitiate an investigation . . . if that assembly’s
    legislative purpose is being served.”). An inquiry into motive
    involves looking behind the stated reasons for a Committee’s
    actions. In the Committee’s investigation, however, the
    “suspicions of criminality” are quite clearly articulated in the
    subpoena, the Cummings Memorandum, and other documents:
    the Committee seeks evidence of alleged unlawful actions by
    the President. See 
    Shelton, 404 F.2d at 1297
    (noting that
    sources for determining “[t]he object of the particular inquiry”
    include “the resolution of the Congress authorizing the
    inquiry,” “the opening statement of the Chairman,” and
    “statements of the members of the committee” (citing 
    Watkins, 354 U.S. at 209
    )); see also 
    Barenblatt, 360 U.S. at 117
    (“[T]he
    nature of the proceedings themselves, might sometimes make
    the topic (under inquiry) clear.” (quoting 
    Watkins, 354 U.S. at 209
    )).
    First, and most overtly, the subpoena seeks to uncover
    “whether the President may have engaged in illegal conduct
    before and during his tenure in office.” Cummings
    Memorandum at 4. This inquiry relates in part to unofficial
    wrongdoing—i.e., events that occurred before President
    Trump’s tenure in office—but also to actions during his tenure
    39
    in office. The investigation specifically targets the President. It
    is not about administration of the laws generally or the
    President’s incidental involvement in or knowledge of any
    alleged unlawful activity within the executive branch. Instead
    the topics of investigation exclusively focus on the President’s
    possible engagement in “illegal conduct.”
    Second, the subpoena seeks to help the Committee
    understand “whether [the President] has undisclosed conflicts
    of interest that may impair his ability to make impartial policy
    decisions.” Id.; see also Appellee Br. 32 (“These documents
    may illuminate whether and to what extent [President] Trump
    misrepresented his liabilities on federal disclosure forms and
    has undisclosed conflicts of interest.”). Again, this inquiry
    seeks to uncover alleged wrongdoing—undisclosed conflicts
    of interest may violate the statutory reporting requirements
    applicable to the President. See Appellee Br. 33 (“[E]xposing
    conflicts of interest is one of the core objectives of the Ethics
    in Government Act.” (quoting Trump v. Comm. on Oversight
    & Reform, 
    380 F. Supp. 3d 76
    , 95 (D.D.C. 2019))).
    Third, the subpoena seeks to investigate “whether [the
    President] is complying with the Emoluments Clauses of the
    Constitution.” Cummings Memorandum at 4; see also
    Appellee Br. 34–35 (discussing “[t]he Oversight Committee’s
    related investigations into [President] Trump’s potential
    violations of the Emoluments Clauses”). On the Committee’s
    own terms, it is investigating whether the President is in
    violation of the constitutional bar on public officials
    “accept[ing] . . . any present, Emolument, Office, or Title.”
    U.S. CONST. art. I, § 9, cl. 8 (Foreign Emoluments Clause); see
    also U.S. CONST. art. II, § 1, cl. 7 (Domestic Emoluments
    Clause). Quite simply the Committee seeks information about
    whether the President is violating the Constitution.
    Fourth, the Committee seeks to inquire about “whether
    [the President] has accurately reported his finances to the
    40
    Office of Government Ethics and other federal entities.”
    Cummings Memorandum at 4; see also Appellee Br. 31 (“[The
    Committee’s] investigations include . . . whether [President]
    Trump . . . submitted inaccurate financial disclosure forms to
    the Ethics Office.”). Again, the Committee seeks to uncover
    whether the President has violated the law in his official
    capacity—namely, the Ethics in Government Act of 1978, 5
    U.S.C. app. 4 § 101 et seq., which imposes financial disclosure
    requirements on the President. The Committee’s jurisdiction
    includes the authority to conduct oversight of the Office of
    Government Ethics and how it implements various ethics
    requirements for federal officials. See Letter from Appellee
    Regarding Oral Argument Matter at 3–4 (July 16, 2019)
    (asserting that the Oversight Committee has jurisdiction over
    the Ethics in Government Act under House Rule X, cl. 1(n)(1)).
    Yet this particular inquiry is not about the administration of the
    Office of Government Ethics or of the laws it administers, but
    rather about reconstructing suspected violations of ethics laws
    by the Chief Executive. The Committee seeks information
    about past transactions related to the President’s financial
    reporting—which, if found inaccurate or incomplete, may
    carry civil and criminal penalties. See 5 U.S.C. app. 4 § 104(a).
    The four inquiries stated in the Cummings Memorandum
    are more than political flourish—they unambiguously set out
    the nature of this investigation. These inquiries are repeated
    throughout statements and letters of the Chairman on behalf of
    the Committee. See, e.g., Letter from Rep. Elijah E.
    Cummings, Chairman, H. Comm. on Oversight and Reform, to
    Pat Cipollone, Counsel to the President (Jan. 8, 2019) (request
    for “documents related to President Trump’s reporting of debts
    and payments to his personal attorney, Michael Cohen”); Letter
    from Rep. Elijah E. Cummings, Chairman, H. Comm. on
    Oversight and Reform, to Emory A. Rounds III, Director of
    Office of Gov’t Ethics (Jan. 22, 2019) (request for “documents
    relating to President Donald Trump’s reporting of debts and
    41
    payments to his personal attorney, Michael Cohen, to silence
    women alleging extramarital affairs”); Letter from Rep. Elijah
    E. Cummings, Chairman, H. Comm. on Oversight and Reform,
    to Pat Cipollone, Counsel to the President (Feb. 15, 2019)
    (demanding answers to “significant questions about why some
    of the President’s closest advisors made [] false claims [about
    alleged payments] and the extent to which they too were acting
    at the direction of, or in coordination with, the President”);
    Letter from Rep. Elijah E. Cummings, Chairman, H. Comm.
    on Oversight and Reform, to Victor Wahba, Chairman and
    Chief Executive Officer, Mazars USA, LLP (Mar. 20, 2019)
    (request for documents citing accusation by Cohen that
    “President Trump changed the estimated value of his assets and
    liabilities on financial statements . . . including inflating or
    deflating the value of assets depending on the purpose for
    which he intended to use the statements”). The Cummings
    Memorandum also relies on the February 27, 2019, hearing
    testimony of Michael Cohen, Cummings Memorandum at 1–2,
    during which the Chairman and Oversight Committee
    members repeatedly invoked allegations of criminality by the
    President. See Appellant Br. 7–8 (collecting statements from
    Cohen hearing). In this subpoena, the Committee has made
    clear that it seeks to investigate illegal conduct of the President.
    Indeed, the majority acknowledges that the Committee has an
    “interest in determining whether and how illegal conduct has
    occurred.” Maj. Op. 30.
    The subpoena itself focuses on information that closely
    tracks the Committee’s stated object of investigating illegal
    conduct. It seeks, “with respect to Donald J. Trump” and his
    organizations, “[a]ll memoranda, notes, and communications”
    and “[a]ll underlying, supporting, or source documents and
    records” relating to multiple categories of financial statements
    going back to 2011, as well as “all engagement agreements or
    contracts” “without regard to time.” In addition, the subpoena
    specifically demands “all communications” between President
    42
    Trump and his accountants and “all communications related to”
    any “potential concerns” that President Trump’s records “were
    incomplete, inaccurate, or otherwise unsatisfactory.”
    The subpoena thus seeks to recreate, in exhaustive detail,
    the exact processes, discussions, and agreements that went into
    preparing the President’s financial records over a multi-year
    period in order to determine whether there is anything
    misleading or problematic in those records. Such requests are
    akin to a criminal grand jury subpoena, designed to “inquire
    into all information that might possibly bear on [the]
    investigation until it has identified an offense or has satisfied
    itself that none has occurred.” United States v. R. Enters., Inc.,
    
    498 U.S. 292
    , 297 (1991). By contrast, “legislative judgments
    normally depend more on the predicted consequences of
    proposed legislative actions . . . than on precise reconstruction
    of past events.” Senate 
    Select, 498 F.2d at 732
    .
    Moreover, the Committee’s litigating position in this case
    continues to emphasize the importance of the four inquiries,
    each of which target the President’s alleged wrongdoing and
    potential violations of statutes and the Constitution: “The
    Oversight Committee is investigating whether [President]
    Trump inaccurately represented liabilities on his statutorily
    mandated financial disclosures, impermissibly benefited from
    a lease with a government agency, and violated the
    Constitution.” Appellee Br. 44; see also 
    id. at 8–17,
    21, 22–23,
    31–35, 42, 44–45. Thus, we need not peer behind the curtain to
    find the Committee’s suspicions of wrongdoing—the
    Committee has explicitly and consistently avowed the purpose
    of investigating alleged illegal activities of the President.
    The Committee also offers a legislative purpose. The
    Cummings Memorandum concludes with the statement that
    “[t]he Committee’s interest in these matters informs [the
    Committee’s] review of multiple laws and legislative proposals
    under [its] jurisdiction.” Cummings Memorandum at 4; see
    43
    also Letter from Rep. Elijah E. Cummings, Chairman, H.
    Comm. on Oversight and Reform, to Pat Cipollone, Counsel to
    the President (Feb. 15, 2019) (“Congress has investigated how
    existing laws are being implemented and whether changes to
    the laws are necessary.”). Thus, even though the legislative
    purpose appears in a single sentence, the Committee states a
    double purpose—to investigate “criminal conduct by
    [President] Trump” and also to pursue remedial legislation
    relating to government ethics. Appellee Br. 44.
    Given the broad power to investigate in aid of legislation,
    remedial legislative purposes will often be sufficient to uphold
    an investigation and accompanying subpoena. See 
    Quinn, 349 U.S. at 160
    –61 (investigative power co-extensive with
    legislative power). The majority finds the Committee’s
    assertion of a legislative purpose sufficient because “[s]uch an
    ‘express avowal of the [Committee’s] object’ offers strong
    evidence of the Committee’s legislative purpose.” Maj. Op. 26
    (quoting 
    McGrain, 273 U.S. at 178
    ). “The Committee’s interest
    in alleged misconduct, therefore, is in direct furtherance of its
    legislative purpose.” 
    Id. at 31.
    In other words, the majority
    acknowledges that the Committee seeks to investigate illegal
    conduct of the President, but then states it is “even more
    important” that the Committee is seeking to “review multiple
    laws and legislative proposals under [its] jurisdiction.” 
    Id. at 26
    (quoting Cummings Memorandum at 4). Because the
    Constitution provides only one way for Congress to investigate
    illegal conduct by the President, the mere statement of a
    legislative purpose is not “more important” when a committee
    also plainly states its intent to investigate such conduct. The
    legislative power cannot support this subpoena.
    The majority ignores the essential constitutional
    distinction between the different investigative powers of
    Congress and turns longstanding practice on its head by
    concluding dismissively that “we can easily reject the
    44
    suggestion that this rationale [of investigating whether the
    ‘President may have engaged in illegal conduct’] spoils the
    Committee’s otherwise valid legislative inquiry.” 
    Id. at 29.
    The
    valid legislative inquiry is not entirely spoiled—the
    Committee’s inquiry into legislative proposals may continue in
    any number of legitimate directions. Yet the Committee’s
    specific investigation targeting the President, if it is to
    continue, may be pursued only through impeachment. Since the
    Republic’s beginning, the President, Congress, and the courts
    have recognized that when Congress seeks to investigate
    individual suspicions of criminality against the President (or
    other impeachable officials), it cannot rely on its legislative
    powers. The legislative power being more general and
    expansive, it cannot trump, so to speak, the more specific
    impeachment power, which is necessary for an investigation of
    the illegal conduct of the President.
    B.
    This is the first time a court has recognized that a
    congressional investigation pertains to “whether and how
    illegal conduct has occurred,” Maj. Op. 30, but then upholds
    that investigation under the legislative power. The majority
    attempts to rely on our precedents to justify this subpoena by
    focusing on whether it is an impermissible exercise of “law
    enforcement” power. 
    Id. at 21–22
    (responding to appellants).
    The majority relies on cases that deal with private citizens and
    problems of administration—but a subpoena against the
    President that investigates allegations of illegal conduct cannot
    be shoehorned into this framework. A review of the cases
    demonstrates the novelty of the majority’s holding.
    The majority maintains that “an interest in past illegality
    can be wholly consistent with an intent to enact remedial
    legislation.” 
    Id. at 29.
    To the extent the precedents support this
    general principle, however, it has been applied only in the
    context of private individuals. It is well established that
    45
    Congress cannot exercise the executive or judicial powers,
    which are vested in the other departments of the government.
    “[T]he power to investigate must not be confused with any of
    the powers of law enforcement; those powers are assigned
    under our Constitution to the Executive and the Judiciary.”
    
    Quinn, 349 U.S. at 161
    . The Court made this general
    observation with respect to private individuals, not
    impeachable public officials. As far as private individuals are
    concerned, Congress emphatically has no law enforcement
    powers—no power to indict, to try, or to convict—and cannot
    enact a bill of attainder that would single out a person for
    punishment through legislation. U.S. CONST. art. I, § 9, cl. 3;
    art. I, § 10, cl. 1; see also 
    Brown, 381 U.S. at 445
    –46 (“[T]he
    Legislative Branch is not so well suited as politically
    independent judges and juries to the task of ruling upon the
    blameworthiness of, and levying appropriate punishment upon,
    specific persons. . . . By banning bills of attainder, the Framers
    of the Constitution sought to guard against such dangers by
    limiting legislatures to the task of rule-making.”).
    The cases cited by the majority demonstrate that during an
    investigation of private activity, the incidental revelation of
    criminal activity is tolerated when Congress has a legitimate
    legislative purpose, 15 precisely because Congress cannot take
    15
    Even when a valid legislative purpose exists, the Court has been
    vigilant in guarding the constitutional rights of private citizens. See
    
    Watkins, 354 U.S. at 198
    –99 (courts cannot “abdicate the
    responsibility placed by the Constitution upon the judiciary to insure
    that the Congress does not unjustifiably encroach upon an
    individual’s right to privacy nor abridge his liberty of speech, press,
    religion or assembly”); 
    Quinn, 349 U.S. at 161
    ; United States v.
    Rumely, 
    345 U.S. 41
    , 44 (1953) (“[W]e would have to be that ‘blind’
    Court . . . not to know that there is wide concern, both in and out of
    Congress, over some aspects of the exercise of the congressional
    46
    any action against a private person for lawbreaking. In
    Hutcheson v. United States, the Supreme Court permitted a
    Senate committee to investigate the unlawful activity of a
    union president despite the fact that, if any wrongdoing was
    uncovered, the evidence might have “warranted a separate state
    prosecution.” 
    369 U.S. 599
    , 617 (1962) (emphasis added). The
    union president was, of course, not amenable to prosecution by
    Congress. Similarly, in Sinclair v. United States, the Court
    allowed a committee to question an oil executive, including on
    matters pertaining to pending criminal proceedings involving
    that executive. 
    279 U.S. 263
    , 290–91, 294–95 (1929). The
    proceedings determining the oil executive’s liability or
    innocence, however, were being conducted by an entirely
    separate branch: the Article III judiciary.
    The Court has upheld some congressional investigations
    that incidentally uncover unlawful action by private citizens in
    part because private individuals cannot be punished by
    Congress, but may be prosecuted by the executive branch and
    then face trial before an independent judiciary. Cf. 
    Kilbourn, 103 U.S. at 182
    (the Constitution requires that prosecutions of
    private individuals proceed by “a trial in which the rights of the
    party shall be decided by a tribunal appointed by law, which
    tribunal is to be governed by rules of law previously
    established”). The majority does not explain why precedents
    about union presidents and oil executives would apply to the
    President when the Constitution provides a wholly separate
    mechanism for Congress to impeach, to try, and, if convicted,
    to remove the President from office.
    Importantly, the majority does not cite a single case in
    which the Court has upheld a congressional committee’s
    investigation into the past illegality of an impeachable official
    power of investigation.” (quoting Bailey v. Drexel Furniture Co.,
    
    259 U.S. 20
    , 37 (1922))).
    47
    for a legislative purpose. In sharp contrast to private
    individuals, Congress possesses not only legislative but also
    judicial powers over officials amenable to impeachment. This
    is a notable and important exception to the separation of
    powers—vesting non-legislative powers in the House and
    Senate for the limited purpose of checking the actions of certain
    high officials. When a legislative investigation turns toward the
    wrongdoing of the President or any impeachable official, it has
    never been treated as merely incidental to a legislative purpose.
    Such investigations require the House to exercise the solemn
    powers of the “NATIONAL INQUEST,” The Federalist No.
    65, at 338, with all of the procedural protections and
    accountability that accompany the decision to target a high
    official.
    Indeed, in the one case dealing with a subpoena to the
    President for legislative purposes, our court did not ask whether
    the Senate Select Committee had a valid legislative purpose in
    investigating the events surrounding the Watergate break-in.
    See Senate 
    Select, 498 F.2d at 732
    (“[T]he need for the tapes
    premised solely on [Congress’s] asserted power to investigate
    and inform cannot justify enforcement of the [Select]
    Committee’s subpoena.”). We concluded instead that a
    legislative purpose could not justify demanding the President’s
    materials “in the peculiar circumstances of this case, including
    the subsequent and on-going investigation of the House
    Judiciary Committee.” 
    Id. at 733.
    As our court explained:
    [T]he House Committee on the Judiciary has
    begun an inquiry into presidential
    impeachment . . . .
    The sufficiency of the [Select] Committee’s
    showing of need has come to depend,
    therefore, entirely on whether the
    subpoenaed materials are critical to the
    48
    performance of its legislative functions.
    There is a clear difference between
    Congress’s legislative tasks and the
    responsibility of a grand jury, or any
    institution engaged in like functions. While
    fact-finding by a legislative committee is
    undeniably a part of its task, legislative
    judgments normally depend more on the
    predicted consequences of proposed
    legislative actions and their political
    acceptability, than on precise reconstruction
    of past events.
    
    Id. at 732.
    Thus, we carefully distinguished legislative tasks
    from grand jury or similar functions. When the House had
    already authorized and was pursuing impeachment
    proceedings, we found that the Senate Select Committee’s
    legislative need was “too attenuated and too tangential to its
    functions to permit a judicial judgment that the President is
    required to comply with the Committee’s subpoena.” 
    Id. at 733.
         Similarly here, the questions of illegal conduct and interest
    in reconstructing specific financial transactions of the President
    are “too attenuated and too tangential” to the Oversight
    Committee’s legislative purposes. 
    Id. The parallels
    between
    our case and Senate Select continue to unfold, as some type of
    “impeachment inquiry” against the President has been invoked
    in the House. See, e.g., Letter from Rep. Adam B. Schiff,
    Chairman, H. Perm. Select Comm. on Intelligence et al., to
    Rudolph Giuliani (Sept. 30, 2019) (transmitting subpoena for
    the President’s papers “[p]ursuant to the House of
    Representatives’ impeachment inquiry”).
    Other cases involving congressional investigations of
    public officials confirm the distinction between impeachment
    and legislative purposes and demonstrate the caution with
    which the Court has ensured Congress is not pursuing
    49
    impeachable offenses in a legislative inquiry. For example, in
    McGrain, the Supreme Court upheld an investigation of the
    Department of Justice only after determining that there was no
    targeted inquiry into unlawful action or allegations of
    impeachable offenses. The Senate resolution sought
    information about “the administration of the Department of
    Justice—whether its functions were being properly discharged
    or were being neglected or misdirected, and particularly
    whether the Attorney General and his assistants were
    performing or neglecting their duties.” 
    McGrain, 273 U.S. at 177
    . While the resolution mentioned Attorney General
    Daugherty, the Court emphasized that the Senate was not
    “attempting or intending to try the Attorney General at its bar
    or before its committee for any crime or wrongdoing.” 
    Id. at 179–80.
    It was essential to the Court’s decision that the
    investigation did not target the unlawful behavior of the
    Attorney General. See 
    id. at 178–80.
         The majority draws a different “lesson” from McGrain:
    “that an investigation may properly focus on one individual if
    that individual’s conduct offers a valid point of departure for
    remedial legislation.” Maj. Op. 31. The majority places
    emphasis on the Court’s statement, “[n]or do we think it a valid
    objection to the investigation that it might possibly disclose
    crime or wrongdoing on [the Attorney General’s] part.”
    
    McGrain, 273 U.S. at 179
    –80. Yet the Court also stressed that
    Congress was not targeting the unlawful behavior of an
    impeachable official and that “[i]t is not as if an inadmissible
    or unlawful object were affirmatively and definitely avowed.”
    
    Id. at 180.
    In McGrain, the Court determined that the inquiry
    at issue was a legislative one, and specifically did not target
    “crime or wrongdoing.” 16 
    Id. Thus, the
    majority cannot rely on
    16
    The Supreme Court in McGrain did not question the legal principle
    articulated by the district court that to investigate the illegal conduct
    50
    McGrain for its novel holding that Congress can investigate
    illegal conduct of an impeachable official pursuant to the
    legislative power.
    Similarly, in Kilbourn, the Court invalidated a subpoena
    against the Secretary of the Navy because it lacked a legitimate
    legislative purpose, while noting that “the whole aspect of the
    case would have been changed” if the investigation related to
    
    impeachment. 103 U.S. at 193
    . No purpose of impeachment
    could be found, however, from the preamble characterizing the
    Secretary of the Navy’s conduct as “improvident.” 
    Id. The Court
    concluded that “the absence of any words implying
    suspicion of criminality repel the idea of such [impeachment]
    purpose, for the secretary could only be impeached for ‘high
    crimes and misdemeanors.’” 
    Id. In McGrain
    and Kilbourn, the
    Court allows Congress some leeway in its legislative
    investigations so long as it is not seeking to use the legislative
    power to circumvent the impeachment process.
    By contrast, the gravamen of the Oversight Committee’s
    investigation in this case is the President’s wrongdoing. The
    Committee has “affirmatively and definitely avowed,”
    
    McGrain, 273 U.S. at 180
    , its suspicions of criminality against
    the President. As we recognized in Senate Select, such inquiries
    are outside the legislative power in part because they pertain to
    subjects proper to an impeachment proceeding in the House,
    which like a grand jury must assess whether “certain named
    of the Attorney General would be an exercise of the judicial power.
    But see Maj. Op. 48 (contending the Supreme Court rejected the
    district court’s reasoning in McGrain). Instead, the Supreme Court
    simply disagreed with the district court’s characterization of the
    proceedings, which were not about the wrongdoing of the Attorney
    General but the administration of the Department of Justice as a
    whole. “[W]hen the proceedings are rightly interpreted, [ ] the object
    of the investigation . . . was to obtain information for legislative
    purposes.” 
    McGrain, 273 U.S. at 177
    .
    51
    individuals did or did not commit specific 
    crimes.” 498 F.2d at 732
    . The majority’s conclusion is inconsistent with our
    precedents, which confirm that investigations of the illegal
    conduct of an impeachable official cannot be pursued through
    the legislative power.
    ***
    This subpoena goes beyond the legislative power precisely
    because it seeks to reconstruct whether the President broke the
    law. The Constitution creates a wholly separate impeachment
    power for such inquiries. The majority implicitly collapses
    these distinct powers when it concludes that the Committee’s
    “interest in determining whether and how illegal conduct has
    occurred . . . is in direct furtherance of its legislative purpose.”
    Maj. Op. 31. Yet the legislative and impeachment powers are
    not interchangeable. Congress, the President, and the courts
    have consistently maintained a careful line between these
    distinct powers. Thus, I would find that this subpoena exceeds
    the legislative power of Congress because it seeks to uncover
    wrongdoing by the President.
    IV.
    By collapsing the distinction between Congress’s
    legislative and impeachment powers, the majority’s decision
    has serious consequences for the separation of powers. The
    decision today expands the legislative power beyond
    constitutional boundaries, calling into question our precedents
    for reviewing the scope of congressional investigations;
    interpreting the legislative power of Congress to subsume the
    impeachment power; and permitting serious encroachments on
    the executive branch. For the majority, the fact that Congress
    seeks the President’s papers is just a “twist” on the history of
    congressional investigations. Maj. Op. 65. In our government
    of three separate and co-equal departments, the targeting of the
    52
    President in a congressional subpoena seeking evidence of
    illegal conduct is no mere “twist,” but the whole plot.
    A.
    At bottom, the majority and I disagree about the meaning
    of the legislative power and whether Congress can use this
    power to conduct investigations of illegal conduct by the
    President. Yet the framework employed by the majority both
    decides too little and too much. To begin with, even though the
    majority determines that the House has the power to issue this
    subpoena, our precedents require making a separate inquiry
    regarding the scope of the Committee’s delegated authority. 17
    The majority begins by recognizing as much: “it matters not
    whether the Constitution would give Congress authority to
    issue a subpoena if Congress has given the issuing committee
    no such authority.” Maj. Op. 18. The majority, however,
    collapses this two-part inquiry by concluding that “[b]ecause
    Congress already possesses—in fact, has previously exercised,
    
    see supra
    at 16–17—the authority to subpoena Presidents and
    their information, nothing in the House Rules could in any way
    ‘alter the balance between’ the two political branches of
    government.” 
    Id. at 59–60
    (quoting Armstrong v. Bush, 
    924 F.2d 282
    , 289 (D.C. Cir. 1991)). The only evidence presented
    to support the conclusion that Congress possesses this authority
    is a citation to the majority’s analysis—which, as discussed
    above, fails to provide a single historical example of a
    17
    Because I conclude that Congress lacks the authority to issue this
    subpoena pursuant to the legislative power, it follows that the House
    could not delegate such authority to the Oversight Committee. See,
    e.g., 
    Rumely, 345 U.S. at 42
    –43 (in assessing validity of
    congressional investigation, court must determine “whether
    Congress had the power to confer upon the committee the authority
    which it claimed”); 
    Kilbourn, 103 U.S. at 196
    (committee has “no
    lawful authority” to investigate if authorizing resolution is “in excess
    of the power conferred on [the House] by the Constitution”).
    53
    successful subpoena to investigate a president for legislative
    purposes. Instead, the majority stitches together a few
    examples of subpoenas that issued to other officials,
    investigations of agency administration, presidents voluntarily
    sharing information with Congress, and one case from our
    court invalidating the only similar subpoena, which was issued
    to President Nixon during the Watergate investigations. 
    Id. at 16–17;
    see also Senate 
    Select, 498 F.2d at 733
    . On this flimsy
    foundation, the majority concludes that it cannot scrutinize the
    House Rules “absent a substantial constitutional question
    pertaining to the House’s legislative power.” Maj. Op. 63.
    This conclusion is unsupported by the Supreme Court’s
    decisions in this area, which have required courts not only to
    consider the scope of legislative power possessed by the House
    or Senate as a whole, but to inquire specifically whether that
    power has been delegated to a particular Committee. See
    United States v. Rumely, 
    345 U.S. 41
    , 42–43 (1953) (“This
    issue—whether the committee was authorized to exact the
    information which the witness withheld—must first be settled
    before we may consider whether Congress had the power to
    confer upon the committee the authority which it claimed.”);
    
    Watkins, 354 U.S. at 201
    (“An essential premise . . . is that the
    House or Senate shall have instructed the committee members
    on what they are to do with the power delegated to them.”).
    This delegation of authority has separate importance because,
    as the Court has admonished, Congress should not separate
    power from responsibility. 
    Watkins, 354 U.S. at 215
    .
    The scope of delegation particularly matters when
    Congress seeks to investigate a co-equal branch of government.
    Requiring a clear statement creates an important form of
    accountability by giving notice to the executive branch.
    Accordingly, “[w]henever constitutional limits upon the
    investigative power of Congress have to be drawn by this
    Court, it ought only to be done after Congress has demonstrated
    54
    its full awareness of what is at stake by unequivocally
    authorizing an inquiry of dubious limits.” 
    Rumely, 345 U.S. at 46
    . We have applied this rule with special force in oversight
    investigations: “[T]he courts have adopted the policy of
    construing such resolutions of authority narrowly, in order to
    obviate the necessity of passing on serious constitutional
    questions.” Tobin v. United States, 
    306 F.2d 270
    , 274–75 (D.C.
    Cir. 1962).
    Moreover, “[o]ut of respect for the separation of powers
    and the unique constitutional position of the President,” the
    Court requires “an express statement by Congress” before
    subjecting the President to legislative restrictions and
    oversight. Franklin v. Massachusetts, 
    505 U.S. 788
    , 800–01
    (1992); see also 
    Armstrong, 924 F.2d at 289
    . These
    longstanding interpretive principles recognize that
    congressional encroachments upon the President raise serious
    constitutional questions, and courts should not reach out to
    decide such questions unless Congress squarely raises the
    issue. 18 One might say Congress does not hide presidents in
    18
    The ordinary analysis of congressional authorization is somewhat
    complicated in this case because, after oral argument, the House
    enacted a resolution ratifying “all current and future investigations,
    as well as all subpoenas previously issued or to be issued . . . to [inter
    alia] the President in his personal or official capacity.” H.R. Res.
    507, 116th Cong. (July 24, 2019). The majority, however, does not
    rely on this Resolution to provide a clear statement, but merely to
    “confirm” the plain meaning of the House Rules, because all the
    parties agree that the Resolution does not expand the Committee’s
    jurisdiction. Importantly, the majority properly expresses skepticism
    and leaves open the question of whether such a resolution can indeed
    provide a post hoc expansion of a committee’s subpoena authority.
    Maj. Op. 63–64. I similarly decline to speculate about the validity of
    a resolution that reaches both forwards and backwards in time to
    authorize investigations of the President. See Dombrowski v.
    55
    mouseholes. Cf. Whitman v. Am. Trucking Ass’ns, Inc., 
    531 U.S. 457
    , 468 (2001).
    Thus, even on the majority’s assertion that the House
    possesses the legislative power to issue this subpoena, the
    Committee might not. The House Rules may upset the balance
    of power by failing to provide notice to the President. 19 While
    courts should properly refrain from micromanaging the House
    Rules, our precedents require reviewing whether Congress has
    taken responsibility for pushing up against constitutional
    limitations. See 
    Watkins, 354 U.S. at 205
    –06. In the novel
    circumstances of this case, the majority has eviscerated this
    longstanding principle and essentially collapsed the broader
    question of constitutional power and the question of a
    committee’s delegated authority.
    Burbank, 
    358 F.2d 821
    , 825 (D.C. Cir. 1966) (“Whether this
    apparently approving action by the full Subcommittee would serve
    as a nunc pro tunc ratification and consequent validation of the
    subpoena for all purposes, we need not decide.”), rev’d in part on
    other grounds sub nom. Dombrowski v. Eastland, 
    387 U.S. 82
    (1967).
    19
    Even without applying the clear statement rule, the majority’s
    “natural reading” of the House Rules to include this subpoena is
    hardly natural, given that for over 200 years the House has declined
    to investigate the wrongdoing of the President without clearly
    designating a special committee or resolution for that purpose. That
    historical backdrop casts significant doubt on the majority’s
    interpretation that a rule making no reference to the President should
    be read to encompass the President. See 
    Tobin, 306 F.2d at 275
    (“[I]f
    Congress had intended the Judiciary Committee to conduct such a
    novel investigation it would have spelled out this intention in words
    more explicit than the general terms found in the authorizing
    resolutions under consideration.”); 
    Barenblatt, 360 U.S. at 117
    –18
    (noting that a vague House rule may acquire content through its
    “long history” and the “course of congressional actions”).
    56
    Another difficulty with the majority’s approach is that it
    focuses on the legislative power in isolation, and therefore
    proceeds to determine the contours of what legislation could be
    had in an area rife with constitutional concerns. See, e.g., Letter
    From Laurence H. Silberman, Acting Att’y Gen., to Rep.
    Howard W. Cannon, Chairman, H. Comm. on Rules and
    Administration 4–5 (Sept. 20, 1974) (construing conflicts of
    interest legislation governing the “executive branch” to apply
    to the President raises “serious questions of constitutionality”
    as such legislation could “disable him from performing some
    of the functions required by the Constitution or [] establish a
    qualification for his serving as President (to wit, elimination of
    financial conflicts) beyond those contained in the
    Constitution”). Responding in part to arguments from the
    appellants, the majority marches through a very detailed and,
    in my view, unnecessary analysis of what specific forms of
    legislation might be possible in this area. Maj. Op. 36–45.
    The majority concludes that amendments to “the Ethics in
    Government Act . . . to require Presidents and presidential
    candidates to file reports more frequently, to include
    information covering a longer period of time, or to provide new
    kinds of information such as past financial dealings with
    foreign businesses or current liabilities of closely held
    companies” would pass constitutional muster. 
    Id. at 38–39.
    The
    majority also affirms that some category of theoretical laws
    requiring presidents to disclose evidence of potential conflicts
    of interest and other financial matters constitute a “less
    burdensome species of laws” than similarly hypothetical laws
    requiring presidents to divest assets or recuse from conflicted
    matters. 
    Id. at 38.
    Based on this analysis of the relative
    constitutionality of as-yet-unenacted laws, the majority
    informs us that we can comfortably conclude such financial
    disclosure laws of the future would not “prevent[] the
    [President] from accomplishing [his] constitutionally assigned
    functions.” 
    Id. at 39–40
    (alterations in original) (quoting Nixon
    57
    v. Adm’r of Gen. Servs., 
    433 U.S. 425
    , 443 (1977)). More
    troubling still, the majority declares that a statute “facilitating
    the disclosure of” any payment of “foreign emoluments” to the
    President would “surely . . . lie[] within constitutional limits,”
    
    id. at 40,
    notwithstanding the fact that the scope of the Foreign
    Emoluments Clause is an unresolved question that is currently
    pending before this court. See Blumenthal v. Trump, No. 19-
    5237, filed Sept. 4. 2019 (D.C. Cir.). The majority passes on
    the constitutionality of a range of different legislative
    possibilities without a single enacted statute before us.
    In the absence of any statute that has run the Article I,
    section 7, gauntlet, such determinations are advisory at best.
    The Article III judicial power extends to deciding cases, not
    applying “statutory litmus test[s],” Maj. Op. 37. From the
    Founding Era to the present, our courts have refrained from
    opining on the constitutionality of legal issues outside of a live
    case or controversy. See Chamber of Commerce v. EPA, 
    642 F.3d 192
    , 208 (D.C. Cir. 2011) (“To seek judicial review of . . .
    a contemplated-but-not-yet-enacted [statute] is to ask the court
    for an advisory opinion in connection with an event that may
    never come to pass.”); Letter from Chief Justice John Jay and
    the Associate Justices of the Supreme Court to President
    George Washington (Aug. 8, 1793) (declining the President’s
    request to issue an advisory opinion). I would avoid passing on
    such questions and simply recognize that an investigation into
    the illegal conduct of the President is outside the legislative
    power altogether because it belongs to the House’s power of
    impeachment for high crimes and misdemeanors.
    B.
    By allowing the Oversight Committee to use the
    legislative power to circumvent the impeachment power, the
    majority substantially disrupts the careful balance between
    Congress and the other departments. The text and structure of
    the Constitution, along with unbroken historical practice, make
    58
    plain the importance of maintaining a line between these
    distinct investigative powers—one ancillary to the legislative
    power, and the other an exercise of the House’s judicial power
    of impeachment. The concerns underlying the distinction are
    fundamental and no mere anachronism.
    To begin with, permitting this subpoena allows Congress
    to use its substantial legislative power to gather information
    that may be used for impeachment without the protections
    inherent in an impeachment investigation or proceeding.
    Impeachable officials are protected from ill-considered
    exercises of this power through careful constitutional design.
    The Constitution divides the impeachment and removal powers
    between the House and Senate, U.S. CONST. art. I, § 2, cl. 5;
    art. I, § 3, cl. 6; limits the scope of impeachable offenses, U.S.
    CONST. art. II, § 4; and provides for limited punishments upon
    conviction by the Senate, U.S. CONST. art. I, § 3, cl. 7. Senate
    trials of impeachment are an exercise of judicial power and
    have always been understood to include constitutional and
    common law protections similar to what might be available in
    the judicial context. 
    Marshall, 243 U.S. at 546
    –48; 
    Kilbourn, 103 U.S. at 191
    ; Jefferson’s Manual §§ 592, 619 (“The trial . . .
    differs not in essentials from criminal prosecutions before
    inferior courts.”); 3 Hinds § 2486 (“[S]uch rules must be
    observed as are essential to justice.” (quoting Op. Att’y Gen.
    of May 9, 1796)); 2 Story § 796 (“[T]he same rules of evidence,
    the same legal notions of crimes and punishments prevail.”).
    Allowing the use of legislative power to reach illegal
    conduct undermines the protections afforded to officials being
    investigated for impeachable offenses. These protections are
    essential given the obvious harms to the reputation and honor
    of officials targeted through the very public process of
    impeachment. See The Federalist No. 65, at 338 (“The delicacy
    and magnitude of a trust which so deeply concerns the political
    59
    reputation and existence of every man engaged in the
    administration of public affairs, speak for themselves.”).
    Moreover, expanding the legislative power to include
    investigations of illegal conduct eviscerates Congress’s
    accountability for impeachment. Such accountability is an
    essential protection for the People, who elect the President as
    well as Members of Congress, and thus have an undeniable
    stake in any congressional targeting of the Chief Executive and
    his chosen officers. The majority allows Congress to evade
    public accountability by permitting investigations of the
    President for illegal conduct outside the “grave and weighty”
    impeachment process. See Maj. Op. 47. With impeachment, the
    Constitution unites power with responsibility. Impeachment
    and removal are Congress’s “sword of Damocles,” but the
    House and Senate must pay a political price for using these
    powers. William H. Rehnquist, Grand Inquests 270 (1992); see
    also Gerhardt, The Federal Impeachment Process 57 (“[T]he
    framers deliberately made the impeachment process
    cumbersome in order to make impeachment difficult to
    achieve.”); O’Sullivan, Impeachment and the Independent
    Counsel Statute, 86 GEO. L.J. at 2229–30 (“The Framers
    intentionally designed the impeachment device to make its
    successful invocation difficult in order to ensure that civil
    officers would not be unduly dependent upon the legislative
    branch.”).
    The House and Senate have consistently maintained the
    importance of this responsibility and explicitly invoked the
    impeachment power when pursuing official wrongdoing. See,
    e.g., 3 Hinds § 2400 (opening Johnson impeachment inquiry);
    H.R. Res. 803, 93d Cong. (opening Nixon impeachment
    inquiry); H.R. Res. 581, 105th Cong. (opening Clinton
    impeachment inquiry). Presidents since George Washington
    have declined demands to produce documents for legislative
    purposes, while acknowledging that the same request pursuant
    60
    to the impeachment power might be treated differently. See
    supra Part II; see also Position of the Executive Department
    Regarding Investigative Reports, 40 Op. Att’y Gen. 45, 51
    (1941) (Attorney General Robert Jackson declining to provide
    information to Congress about pending FBI investigations, but
    noting that “pertinent information would be supplied in
    impeachment proceedings”). 20
    Overlooking the special procedures and accountability
    attendant to an impeachment proceeding, the district court
    conflated the legislative and judicial powers of the House. With
    no support in the text, structure, or history of the Constitution,
    the district court cited the impeachment power to bootstrap a
    more expansive legislative power to investigate individual
    wrongdoing: “It is simply not fathomable that a Constitution
    that grants Congress the power to remove a President for
    reasons including criminal behavior would deny Congress the
    power to investigate him for unlawful conduct—past or
    present—even without formally opening an impeachment
    inquiry.” Trump, 
    380 F. Supp. 3d
    at 95.
    The district court suggests that the greater power of
    impeachment and removal must include the lesser legislative
    power to investigate illegal actions by the President. Yet the
    Constitution is not designed this way. The greater power does
    not include the lesser in a Constitution that explicitly vests
    Congress with limited and enumerated legislative powers and
    20
    As the Committee has not relied on the impeachment power for
    this subpoena, I do not consider whether or how this court would
    assess such a demand for documents under the impeachment power.
    I simply note that Congress, the Executive, and the courts have
    maintained that requests under the legislative and impeachment
    powers may be treated differently. See, e.g., 
    Kilbourn, 103 U.S. at 193
    (were the investigation related to impeachment, “the whole
    aspect of the case would have been changed”).
    61
    then provides for a wholly separate impeachment power with
    different objects, processes, and limits. It is not only
    fathomable, but essential, that the impeachment and legislative
    powers remain distinct. The power of impeachment does not
    somehow expand the power to investigate for legislative
    purposes.
    The majority similarly recognizes no separation between
    the House’s judicial and legislative powers. But once the
    boundary between the legislative and judicial powers is
    breached, it is hard to discern any limit to the reach of the
    legislative power of investigation. Perhaps the functionalist
    approach to reading the Constitution has obscured the essential
    core of the constitutional powers vested in each of the three
    branches. The legislative power focuses on prospective,
    general rules for governing society. One thing it has never been
    is the power to reconstruct and punish individual actions,
    whether of private individuals or public officials. Private and
    public individuals are protected by the Bill of Attainder
    Clauses, U.S. CONST. art. I, § 9, cl. 3; art. I, § 10, cl. 1, and
    Congress may pursue the high crimes and misdemeanors of
    impeachable officials exclusively through the impeachment
    power, U.S. CONST. art. I, § 2, cl. 5; art. I, § 3, cl. 6.
    Thus, it should be startling when the majority asserts it is
    a “quintessentially legislative judgment that some concerns
    about potential misconduct are better addressed through . . .
    legislation than impeachment.” Maj. Op. 49. The majority
    argues in effect that Congress must be able to choose to target
    the wrongdoing of the President through its legislative powers,
    instead of impeachment. If this does not quite sanction a bill of
    attainder, it comes awfully close. The majority’s assertions that
    Congress can simply choose between legislation and
    impeachment when the President’s wrongdoing is at issue are
    unsupported by any constitutional provision and provide no
    rebuttal to the remarkably consistent historical understanding,
    62
    which demonstrates that both the executive branch and
    Congress, despite their conflicting interests, have steadfastly
    maintained the necessity of pursuing wrongdoing of public
    officials through impeachment.
    The majority attempts to bolster its argument by
    referencing a functional separation of powers and citing to
    interpretations of Madison’s statement in Federalist 47 that the
    separation of powers “do[es] not mean that these departments
    ought to have no partial agency in, or no control over, the acts
    of each other.” 
    Id. at 43
    (citing Clinton v. Jones, 
    520 U.S. 681
    ,
    702–03 (1997), and Nixon v. Adm’r of Gen. 
    Servs., 433 U.S. at 442
    –43). Yet Madison’s words are being taken out of context.
    In Federalist 47, Madison makes this statement when
    interpreting Montesquieu’s theory of separation of powers. See
    The Federalist No. 47, at 251 (James Madison). Madison’s
    primary point is that “[n]o political truth is certainly of greater
    intrinsic value, or is stamped with the authority of more
    enlightened patrons of liberty,” than the maxim that “the
    legislative, executive, and judiciary departments, ought to be
    separate and distinct.” 
    Id. at 249.
    The general rule of the
    Constitution is separation of powers—but the Constitution
    includes certain specific exceptions to the general rule, such as
    requiring the advice and consent of the Senate in the
    appointment of executive officers, or placing the judicial power
    of impeachment in the House and Senate. These exceptions
    reinforce the system of checks and balances and “provide some
    practical security for each, against the invasion of the others.”
    The Federalist No. 48, at 256–58 (James Madison). Madison
    explains at length the deliberate structure of the Constitution,
    which permits overlap or sharing of powers for limited
    purposes without collapsing any one branch into dependence
    on another.
    The exceptions to the separation of powers, however, have
    never been mistaken as a rule of flexible blending of powers
    63
    for the sake of convenience or expediency. To the contrary, the
    Court has read the exceptions narrowly and interpreted them to
    reinforce the constitutional limits that separate the three powers
    of the federal government. See 
    Myers, 272 U.S. at 116
    (“[T]he
    reasonable construction of the Constitution must be that the
    branches should be kept separate in all cases in which they were
    not expressly blended, and the Constitution should be
    expounded to blend them no more than it affirmatively
    requires.”). The majority alleges that this dissent “would
    reorder the very structure of the Constitution,” Maj. Op. 49, but
    provides no analysis of the Constitution to support its assertion.
    Similarly, the majority offers no evidence from the original
    meaning, historical practice, or our judicial precedents for its
    contrived claim that Congress can simply choose to use either
    the legislative or impeachment powers when investigating the
    President for violations of the law.
    Instead, the majority chooses to march out a parade of
    horribles about what might happen if Congress were unable to
    investigate illegal conduct under its legislative power. 
    Id. at 46–47,
    48–49. Contrary to the majority’s ahistorical alarm,
    maintaining the separation of the legislative and impeachment
    powers will in no way prevent the House from continuing to
    pursue remedial legislation. I do not question the longstanding
    recognition that Congress possesses the ability to investigate as
    necessary and proper to effectuate the legislative power. Such
    investigations can provide important and salutary oversight of
    administration of the laws and study the basis for new
    legislation. Yet targeting officials for impeachable offenses
    must proceed, and always has proceeded, through the
    impeachment power.
    Thus, there is no “Hobson’s Choice” here between
    impeachment or nothing, 
    id. at 49,
    because whether the House
    moves forward with impeachment or not, Congress retains all
    of the legislative powers it has under the Constitution to
    64
    introduce and enact legislation. The fact that Congress cannot
    reconstruct “whether and how” the President violated the law
    as part of the legislative power does not “strip[] Congress of its
    power to legislate.” 
    Id. Indeed, frustration
    with lack of access
    to documents might prompt Congress to attempt legislation that
    requires such disclosure in the future, and similar legislation
    has already been proposed. See, e.g., H.R. 1, 116th Cong.,
    §§ 8012, 8013 (2019) (increasing stringency of presidential
    corporate financial disclosure requirements). To treat an
    inquisitorial power as essential to legislation is to
    misunderstand the legislative power in the context of our
    constitutional system of separated powers. The Committee
    cannot use a legislative purpose to circumvent the House’s
    power to serve as the grand inquest of the nation when
    investigating the illegal conduct of the President.
    C.
    Allowing the legislative power to reach investigation of
    impeachable offenses provides Congress with a new bludgeon
    against the Executive, making it all too easy for Congress to
    encroach on the executive branch by targeting the President
    and his subordinates through legislative inquiries. See Nixon v.
    Fitzgerald, 
    457 U.S. 731
    , 743 (1982) (a “special solicitude [is]
    due to claims alleging a threatened breach of essential
    Presidential prerogatives under the separation of powers”). The
    majority incorrectly asserts “no party argues that compliance
    with the subpoena would impair the President’s execution of
    the Article II power.” Maj. Op. 46; see also 
    id. at 6
    4–65. To the
    contrary, both the Trump plaintiffs and the Department of
    Justice argue that this subpoena may “distract a President from
    his public duties, to the detriment of not only the President and
    his office but also the Nation that the Presidency was designed
    to serve.” Appellants Reply Br. 3 (quoting 
    Fitzgerald, 457 U.S. at 753
    ); see also DOJ Br. 6 (“[C]ongressional committees may
    issue successive subpoenas in waves, making far-reaching
    65
    demands that harry the President and distract his attention.”
    (citing 
    Rumely, 345 U.S. at 46
    )). The majority repeatedly states
    that the precedents allow Congress to choose between the
    legislative and impeachment powers, but only where “no
    intrusion on the President’s execution of his official duties is
    alleged.” Maj. Op. 46; see also 
    id. at 45.
    Yet contrary to the
    majority’s assertions, both the Department of Justice and the
    President have alleged that the subpoena encroaches on the
    executive power, which substantially undermines the
    majority’s premise.
    By allowing any claim of a remedial legislative purpose to
    justify an investigation into the “illegal conduct” of the
    President, the majority effectively expands the already
    expansive legislative power. Cf. Brewster v. United States, 
    255 F.2d 899
    , 901 (D.C. Cir. 1958) (rejecting an interpretation that
    “for all practical purposes, would give the Committee on
    Government Operations jurisdiction to investigate virtually
    every activity engaged in by every person in the land”).
    Pursuant to its legislative powers, Congress already has
    substantial leeway to investigate how executive officers are
    administering their duties. Yet allowing Congress to use the
    legislative power to investigate individual officials for
    unlawful conduct takes “oversight” to a whole new level. The
    Constitution provides in effect that Congress cannot reach such
    allegations by “side-blows,” Cong. Globe, 29th Cong., 1st
    Sess. 641 (1846) (statement of Rep. Adams), but must instead
    proceed through impeachment. Cf. Morrison v. Olson, 
    487 U.S. 654
    , 713 (1988) (Scalia, J., dissenting) (“How much easier it is
    for Congress, instead of accepting the political damage
    attendant to the commencement of impeachment proceedings
    against the President on trivial grounds . . . simply to trigger a
    debilitating criminal investigation of the Chief Executive.”).
    Unhindered by the constitutional mechanisms of
    accountability, Congress can expand its incursions against the
    66
    Executive. As Madison cautioned, Congress’s “constitutional
    powers being at once more extensive, and less susceptible of
    precise limits, it can, with the greater facility, mask under
    complicated and indirect measures, the encroachments which
    it makes on the co-ordinate departments.” The Federalist No.
    48, at 257; see also 
    Zivotofsky, 135 S. Ct. at 2096
    (“It was an
    improper act for Congress to ‘aggrandize its power at the
    expense of another branch.’” (quoting Freytag v. Comm’r, 
    501 U.S. 868
    , 878 (1991))).
    The majority takes a narrow view of potential harms to the
    executive branch—suggesting that such harms result largely
    from the inconvenience of the President having to produce
    documents or make copies himself. Maj. Op. 34–35, 65. Yet
    using the legislative power to target and uncover illegal
    conduct by executive officials provides Congress with an
    additional form of control over executive officials who
    otherwise must be within the direction and control of the
    President. See U.S. CONST. art. II, § 1, cls. 1, 8; art. II, § 3; Free
    Enter. Fund v. Pub. Co. Accounting Oversight Bd., 
    561 U.S. 477
    , 493 (2010) (invalidating restrictions on the removal power
    that would “impair[]” the President’s “ability to execute the
    laws [] by holding his subordinates accountable for their
    conduct”); 
    Myers, 272 U.S. at 163
    –64 (“[A]rticle 2 grants to
    the President the executive power of the government, i. e., the
    general administrative control of those executing the laws.”).
    The President cannot “take Care that the Laws be faithfully
    executed,” U.S. CONST. art. II, § 3, if his subordinates are
    exposed to inquisitorial jeopardy through the ordinary
    legislative power.
    Under the majority’s decision, Congress may choose to
    launch investigations of illegal conduct under the legislative
    power—a choice that under the current rules may be
    implemented by a single committee chairman without the
    accountability and deliberation that precede impeachment. And
    67
    while this case deals only with a single subpoena, the
    recognition of a wholly unprecedented power to investigate
    shifts the balance between the branches and may unleash
    additional subpoenas against the President or his subordinates,
    which “may, like a flicking left jab, confound the Executive
    Branch in dealing with Congress.” In re Sealed Case, 
    838 F.2d 476
    , 508 (D.C. Cir. 1988) (Silberman, J.), rev’d sub nom.
    Morrison v. Olson, 
    487 U.S. 654
    (1988).
    While congressional oversight investigations may probe a
    wide range of matters and often are no picnic for executive
    officials, such investigations may proceed ancillary to the
    legislative power. Allegations and reconstructions of illegal
    conduct, however, are an entirely different matter. If a
    congressional committee can invoke a legislative purpose to
    subpoena information targeting unlawful actions by the
    President, imagine the peril for other officers who lack the
    ability to fend off such requests and cannot depend on the
    visibility and public mandate that follow the President. Cf.
    
    Morrison, 487 U.S. at 713
    (Scalia, J., dissenting) (“[A]s for the
    President’s high-level assistants, who typically have no
    political base of support, it is [] utterly unrealistic to think that
    they will not be intimidated by this prospect [of an independent
    counsel], and that their advice to him and their advocacy of his
    interests before a hostile Congress will not be affected . . . . It
    deeply wounds the President, by substantially reducing the
    President’s ability to protect himself and his staff.”). The
    prospect of a Congress that can use the legislative power, rather
    than impeachment, to reach illegal conduct of executive
    officers could very well “weaken the Presidency by reducing
    the zeal of his staff.” 
    Id. *** Allowing
    Congress to investigate impeachable officials
    for suspicions of criminality pursuant to the legislative power
    has serious consequences for the separation of powers because
    68
    it allows Congress to escape the responsibility and
    accountability inherent in impeachment proceedings.
    Congressional aggrandizement in this case comes at the
    expense of the Executive, which no longer can rely on
    procedural protections when Congress, or a single committee
    chairman, determines to investigate unlawful activity of the
    President. The House’s overreaching also comes at the expense
    of the People, who established a Constitution with specific
    processes for electing both Members of Congress and the
    President and which provides only one way for Congress to
    punish and remove the President.
    V.
    The familiar tale recounted by the majority describes a
    general arc of expanding legislative powers and the
    accompanying recognition of Congress’s power to investigate
    ancillary to those powers. Yet the more specific story here
    pertains to the fundamental separation between the legislative
    and judicial powers of Congress. When the House chooses to
    investigate the President for alleged violations of the laws and
    the Constitution, it must proceed through impeachment, an
    exceptional and solemn exercise of judicial power established
    as a separate check on public officials. This constitutional
    principle was articulated by George Washington in 1796 and
    by the House in 1998: “The Constitution contains a single
    procedure for Congress to address the fitness for office of the
    President of the United States—impeachment by the House,
    and subsequent trial by the Senate.” H.R. Rep. No. 105-830, at
    137 (report of the House Judiciary Committee recommending
    articles of impeachment).
    The Constitution and our historical practice draw a
    consistent line between the legislative and judicial powers of
    Congress. The majority crosses this boundary for the first time
    by upholding this subpoena investigating the illegal conduct of
    the President under the legislative power. I respectfully dissent.