Once elected and after Congress has certified the Electoral votes, a President of The United States may only be removed from office by Impeachment. The right to impeach public officials is secured by the U.S. Constitution in Article I, Sections 2 and 3, which discuss the procedure, and in Article II, Section 4, which indicates the grounds for impeachment: "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." Removing an official from office requires two steps: (1) a formal accusation, or impeachment, by the House of Representatives, and (2) a trial and conviction by the Senate. Impeachment requires a majority vote of the House; conviction is more difficult, requiring a two-thirds vote by the Senate. The vice president presides over the Senate proceedings in the case of all officials except the president, whose trial is presided over by the chief justice of the Supreme Court. Only two U.S. presidents have been impeached: Andrew Johnson, the seventeenth chief executive, and your favorite, William J. Clinton, the forty-second.