July 31, 1875) was the 17th president of the United States, serving from 1865 to 1869. He assumed the presidency as he was vice president at the time of the assassination of Abraham Lincoln. In 1866, he went on an unprecedented national tour promoting his executive policies, seeking to break Republican opposition. As the conflict grew between the branches of government, Congress passed the Tenure of Office Act restricting Johnson's ability to fire Cabinet officials. He persisted in trying to dismiss Secretary of War Edwin Stanton, but ended up being impeached by the House of Representatives and narrowly avoided conviction in the Senate. He did not win the 1868 Democratic presidential nomination and left office the following year. Stewart, David O. Stewart, David O. (2009). Impeached: the Trial of President Andrew Johnson and the Fight for Lincoln's Legacy.