The Constitution concentrates removal powers in the Congress by empowering and obligating the House of Representatives to impeach both executive and judicial officials for "Treason, Bribery, or other high Crimes and Misdemeanors". Impeachment is a "formal accusation" of unlawful activity by a civil officer or government official. The Senate is constitutionally empowered and obligated to try all impeachments. A simple majority in the House is required to impeach an official; however, a two-thirds majority in the Senate is required for conviction. A convicted official is automatically removed from office; in addition, the Senate may stipulate that the defendant be banned from holding office in the future. Impeachment proceedings may not inflict more than this; however, a convicted party may face criminal penalties in a normal court of law. In the history of the United States, the House of Representatives has impeached sixteen officials, of whom seven were convicted. Another resigned before the Senate could complete the trial. Only three presidents have ever been impeached: Andrew Johnson in 1868, Bill Clinton in 1999, Donald Trump in 2019 and 2021. The trials of Johnson, Clinton, and the 2019 trial of Trump all ended in acquittal; in Johnson's case, the Senate fell one vote short of the two-thirds majority required for conviction. In 1974, Richard Nixon resigned from office after impeachment proceedings in the House Judiciary Committee indicated he would eventually be removed from office.