order in which their department (or the department of which their department is the successor) was created. Those individuals who are constitutionally ineligible to be elected to the presidency are also disqualified from assuming the powers and duties of the presidency through succession. No statutory successor has yet been called upon to act as president. Declarations of inability Under the Twenty-fifth Amendment, the president may temporarily transfer the presidential powers and duties to the vice president, who then becomes acting president, by transmitting to the speaker of the House and the president pro tempore of the Senate a statement that he is unable to discharge his duties. The president resumes his or her powers upon transmitting a second declaration stating that he is again able. The mechanism has been used by Ronald Reagan (once), George W. Bush (twice), and Joe Biden (once), each in anticipation of surgery. The Twenty-fifth Amendment also provides that the vice president, together with a majority of certain members of the Cabinet, may transfer the presidential powers and duties to the vice president by transmitting a written declaration, to the speaker of the House and the president pro tempore of the Senate, to the effect that the president is unable to discharge his or her powers and duties. If the president then declares that no such inability exist, he or she resumes the presidential powers unless the vice president and Cabinet make a second declaration of presidential inability, in which case Congress decides the question. Removal Article II, Section 4 of the Constitution allows for the removal of high federal officials, including the president, from office for "treason, bribery, or other high crimes and misdemeanors". Article I, Section 2, Clause5 authorizes the House of Representatives to serve as a "grand jury" with the power to impeach said officials by a majority vote. Article I, Section 3, Clause6 authorizes the Senate to serve as a court with the power to remove impeached officials from office, by a two-thirds vote to convict. Three presidents have been impeached by the House of Representatives: Andrew Johnson in 1868, Bill Clinton in 1998, and Donald Trump in 2019 and 2021; none have been convicted by the Senate. Additionally, the House Judiciary Committee conducted an impeachment inquiry against Richard Nixon in 1973–74 and reported three articles of impeachment to the House of Representatives for final action; however, he resigned from office before