Impeachment of Andrew Johnson
Johnson was Appointed Military Governor
Washington D.C., U.S.
Then after several states left the Union, including his own, he chose to stay in Washington (rather than resign his U.S. Senate seat), and later, when Union troops occupied Tennessee, Johnson was appointed military governor. While in that position he had exercised his powers with vigor, frequently stating that "treason must be made odious and traitors punished".