The impeachment process is a process that is to convict an official of unlawful activity, and when the outcome is determined if convicted, the official can be removed from office. Andrew Johnson was accused of unlawful activity and set up for a trail by Congress. President Andrew Johnson was accused of trying to replace Edwin Stanton as Secretary of War and denied the acts of Congress. He was impeached in 1868. Congress did not convict President Andrew Johnson because they failed to receive the three-fourths vote needed to convict and remove President Andrew Johnson from office. Congress failed to get three-fourths vote by one vote alone. If convicted Andrew Johnson would have been removed from office. 

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