answers: Andrew Johnson
context: impeached by Congress. On March 5, 1868, the impeachment trial began in the Senate. Congressmen George S. Boutwell, Benjamin Butler, and Thaddeus Stevens acted as managers for the House, or prosecutors, while William M. Evarts, Benjamin R. Curtis and former Attorney General Stanbery were Johnson's counsel. Chief Justice Chase served as presiding judge. The defense relied on the provision of the Tenure of Office Act that made it applicable only to appointees of the current administration. Since Lincoln had appointed Stanton, the defense maintained Johnson had not violated the act; they also argued that the president had the right to </s> was put under the control of the U.S. military. Additionally, these states were required to enact new constitutions, ratify the Fourteenth Amendment, and guarantee voting rights for black males. Congress's control of the military Reconstruction policy was mitigated by Johnson's command of the military as president; however, Johnson had inherited, as Secretary of War, Lincoln's appointee Edwin M. Stanton, a staunch Radical Republican, who as long as he remained in office would comply with Congressional Reconstruction policies. To ensure that Stanton would not be replaced, Congress passed the Tenure of Office Act in 1867 over Johnson's veto. The act required </s> standards specified in : "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". () Impeachment can also occur at the state level. Each state's legislature can impeach state officials, including the governor, in accordance with their respective state constitution. The number of federal officials impeached by the House of Representatives includes two presidents: Andrew Johnson and Bill Clinton; both were later acquitted by the Senate. Additionally, an impeachment process against Richard Nixon was commenced, but not completed, as
question: who 's the first president to be impeached