Impeachment: "The accusation and prosecution of a person for treason or other high crime or misdemeanour before a competent tribunal... in U.S., a similar process in which the accusers are the House of Representatives and the court is the Senate."
- OED Online (UW Restricted)
Article 2, Section 4 of the Constitution, gives Congress the power to impeach the President if convicted of "Treason, Bribery, or other High crimes and Misdemeanors".
Image courtesy of the National Archives and Records Administration.