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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
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.