In 1868, President Andrew Johnson was impeached after he removed Secretary of War Edwin Stanton from office without first getting approval from the Senate. President Johnson was impeached because he had violated the Tenure of Office Act.
The Tenure of Office Act was a United States federal law which was putt in place to restrict the power of the president from removing some people in government without the approval of the Senate. President Andrew Johnson flouted this law when he removed Secretary of War Edwin Stanton from office without first getting approval from the Senate.
