Impeachment — House Impeachment & Senate Trial

Impeachment does not remove an official from office. That is the most important thing to understand about the process: the House impeaches (indicts), and the Senate convicts and removes — two separate steps requiring separate votes in separate chambers with different thresholds. A President who has been impeached by the House remains in office unless and until the Senate convicts by a two-thirds vote. All three presidents who have been impeached — Andrew Johnson (1868), Bill Clinton (1998), and Donald Trump (2019, 2021) — were acquitted by the Senate and remained (or had already left) office. Understanding this distinction explains why impeachment is often described as a political process more than a legal one: impeachment is achievable by a partisan House majority, but removal requires a two-thirds Senate supermajority that almost always requires bipartisan agreement.

Legal Authority

• U.S. Const. art. I, § 2, cl. 5 — "The House of Representatives shall have the sole Power of Impeachment"; vests exclusive authority to initiate and vote articles of impeachment in the House
• U.S. Const. art. I, § 3, cl. 6–7 — "The Senate shall have the sole Power to try all Impeachments"; requires two-thirds vote to convict; conviction does not extend beyond removal from office and disqualification from future office; further criminal prosecution is not barred
• U.S. Const. art. II, § 4 — "The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors"
• U.S. Const. art. III, § 1 — (implicitly) defines "civil Officers" subject to impeachment — judges serve during "good Behaviour," and impeachment is how they are removed; this is the only mechanism for removing federal judges

Key Mechanics

Impeachment is a two-stage constitutional process. In the House, the Judiciary Committee (or a select committee) investigates the subject, drafts articles of impeachment, and votes to refer them to the full House; the full House adopts articles by simple majority vote. There is no supermajority requirement in the House. Once articles are adopted, the House selects "managers" (typically Judiciary Committee members) who act as prosecutors in the Senate trial. In the Senate, the Chief Justice of the United States presides over presidential impeachment trials; for all other officials, the Vice President (or President pro tempore) presides. Senators sit as jurors; conviction requires a two-thirds vote of senators present. A conviction automatically removes the officer from office; the Senate may then vote by simple majority to disqualify the convicted officer from holding future federal office. The sole constitutional consequence of conviction is removal and potential disqualification — criminal prosecution in Article III courts follows the ordinary criminal justice process. Four federal officials have been impeached by the House and convicted by the Senate (all federal judges); three presidents have been impeached (Andrew Johnson, Bill Clinton, Donald Trump twice) and acquitted by the Senate; Richard Nixon resigned before the full House voted on articles that the Judiciary Committee had approved.

How It Works

Grounds: "High Crimes and Misdemeanors"

The constitutional phrase "high Crimes and Misdemeanors" does not map to the criminal code. The Framers borrowed it from English parliamentary practice, where it referred to abuses of public trust and official power rather than purely personal criminal conduct. The phrase has been interpreted by Congress through practice rather than judicial definition — courts have consistently declined to review the substance of impeachment proceedings, treating them as a non-justiciable political question (Nixon v. United States, 1993 — applying to a federal judge, not the President).

What qualifies as an impeachable offense is thus whatever a majority of the House and two-thirds of the Senate decide it is. Presidential impeachments have included: abuse of office and obstruction of justice (Nixon — resignation pre-vote); perjury and obstruction of justice (Clinton); abuse of power and obstruction of Congress (Trump I); incitement of insurrection (Trump II). Scholarly debate continues about whether impeachment requires criminal conduct or can extend to noncriminal abuses of power — the historical consensus favors a broader reading that includes serious abuses of official position.

Who Is Impeachable

"Civil officers of the United States" subject to impeachment include:

• The President and Vice President (explicitly named in Art. II § 4)
• Federal judges — all Article III judges (district, circuit, Supreme Court) and Article I judges
• Cabinet secretaries and other executive officers

Members of Congress have historically been considered not impeachable — they are subject to expulsion by their own chamber under Art. I, § 5. The Senate in 1799 dismissed the impeachment of Senator William Blount on grounds that senators are not "civil officers" subject to impeachment.

Private citizens who have left office are generally not impeachable, though Trump's second impeachment (for conduct as President, voted on after he left office) raised this question directly. The Senate voted 56-44 that the trial was constitutional — a majority, but not the required two-thirds, and the vote to convict fell short.

House Process

1. Preliminary inquiry: Investigations begin in the House Judiciary Committee (for executive officials) or the relevant committee of jurisdiction. The Judiciary Committee has historically initiated presidential impeachment inquiries, though the House may by resolution assign investigative authority to a select committee (as with the January 6th Select Committee).

2. Formal inquiry resolution: The full House may vote on a resolution authorizing a formal impeachment inquiry, which formalizes the investigation and typically expands the committee's subpoena authority. Whether this step is required is contested — the House went directly to articles during Trump's first impeachment without a separate inquiry authorization vote.

3. Articles of impeachment: The Judiciary Committee drafts specific articles (charges). Each article alleges a distinct impeachable offense. The committee votes to approve the articles and report them to the full House.

4. House floor vote: The full House debates and votes on each article separately. A simple majority on any article results in impeachment on that article. The President is "impeached" once any article passes.

Senate Trial

5. House managers appointed: The Speaker appoints House impeachment managers — members who act as prosecutors in the Senate trial. In recent impeachments, the managers have been drawn from the Judiciary Committee and other committees involved in the investigation.

6. Articles delivered: The House managers deliver the articles to the Senate, which formally triggers the trial proceedings.

7. Presiding officer: The Chief Justice of the United States presides over the Senate trial when the President is tried (Art. I, § 3, cl. 6). For all other impeachment trials, the Vice President (in their capacity as President of the Senate) or the President pro tempore presides. Chief Justice John Roberts presided over both Trump trials (2020, 2021). Chief Justice Salmon Chase presided over Johnson's trial (1868); Chief Justice William Rehnquist presided over Clinton's (1999).

8. Trial proceedings: The Senate sitting as a court of impeachment hears opening arguments from House managers and the defense, may call witnesses (though this is contested and has been limited in recent trials), and conducts deliberations. The rules for the trial are adopted by the Senate at the outset and have varied considerably across impeachments.

9. Verdict: Each article is voted on separately. Two-thirds of senators present must vote to convict for removal — not two-thirds of the full Senate. If the Senate convicts on any article, the official is removed immediately. Following conviction, the Senate may take a separate vote (simple majority) on disqualification from holding future federal office.

Post-Term Impeachment

Trump's second impeachment raised whether a former official — already out of office — can be impeached and tried. Proponents argued the Senate retains jurisdiction because the separate disqualification penalty can still be imposed. The Senate voted 56-44 that the trial of a former President is constitutional, but acquitted Trump 57-43 (10 short of the two-thirds threshold needed to convict). The constitutional question of post-term impeachability remains unsettled as a legal matter.

Federal Judge Removals

Federal judges have been the most frequent targets of impeachment — 15 federal judges have been impeached by the House, and 8 have been convicted and removed by the Senate. Grounds have included criminal conduct (bribery, tax evasion), conduct unbecoming a judge, and in one case, insanity. Because Article III judges have life tenure removable only by impeachment, it is the exclusive mechanism for removing a federal judge — the President cannot remove a federal judge. Recent notable judicial impeachments include G. Thomas Porteous Jr. (2010), who was removed for bribery and perjury.

Presidential Impeachment Cases

How It Affects You

If you are a citizen or voter: Impeachment is designed as a remedy for abuse of official power, not as a routine political weapon — but the low House threshold (simple majority) makes it achievable by any majority willing to use it. The critical constraint is the Senate: without a 67-vote supermajority, impeachment results in acquittal and the official returns to office (or remains a private citizen, in post-term cases). An acquittal can actually strengthen an official's political position by framing the impeachment as a partisan overreach. The more lasting effects of recent presidential impeachments have been in the investigative record they created — testimony, documents, and findings that shape public understanding of events even where conviction failed.

If you are an advocate, lobbyist, or interest group: Impeachment of executive officials — beyond presidents — is a theoretical check that rarely materializes. More practically, the threat of impeachment proceedings can alter agency behavior: officials aware that their decisions are being scrutinized for potential impeachment articles may be more cautious in their exercise of discretionary authority. The House Judiciary Committee's broad investigative jurisdiction over executive branch conduct — including subpoenas that can be enforced through contempt proceedings — creates oversight pressure even short of formal impeachment. For independent agency officials with removal protections, impeachment may be the only mechanism for removal if a court holds that the for-cause removal statute is constitutional.

If you work at a federal agency: An impeachment inquiry targeting an executive official creates immediate operational disruption. Documents are subpoenaed, staff are called to testify, and the agency's normal work is subordinated to compliance with congressional demands. The White House Counsel's office typically coordinates executive branch responses, including assertions of executive privilege. If you receive a subpoena or are asked to testify in connection with an impeachment inquiry, your agency's general counsel and the White House Counsel's office will be your primary contacts — do not respond to congressional inquiries unilaterally.

If you are a journalist, researcher, or policy analyst: Impeachment proceedings generate an unusually rich documentary record: committee depositions (often behind closed doors initially), transcripts released by the committee, exhibits admitted during the Senate trial, and committee reports explaining the factual and legal basis for each article. The Senate impeachment trial record is published in the Senate Journal and by GPO. For historical context, the House Judiciary Committee's reports on prior impeachments (Nixon, Clinton) remain the most thorough legal analyses of what constitutes an impeachable offense under current congressional interpretation.

Recent Developments

• 2021 — Trump's second impeachment became the first impeachment of a President after leaving office; the 57-43 Senate vote to convict fell short of two-thirds but exceeded the 50-vote simple majority, establishing that bipartisan support for conviction existed even if not at the supermajority threshold
• 2024 — House Republicans impeached DHS Secretary Alejandro Mayorkas in February 2024 on a 214-213 party-line vote — the first Cabinet secretary impeached since 1876; the Senate in April 2024 dismissed both articles without a trial (51-48 / 51-49 votes), an outcome that raised questions about the Senate's obligation to conduct a trial
• 2024 — The Supreme Court's Trump v. United States decision on presidential immunity, while not directly addressing impeachment, created new questions about the relationship between criminal prosecution and the impeachment remedy for official acts