Lincoln's Secretary of War was Edwin M. Stanton. He had contested with Lincoln for the Republican nomination for President in 1860.
Stanton
President Andrew Johnson was accused of violating the Tenure of Office Act by removing the Secretary of War from office. He was the first President to be impeached.
President Johnson. Alaska was known as Seward's Folly because Seward was Johnson's Secretary of State that negotiated the purchase for the United States.
He violated the Tenure of Office act when he fired his Secretary of War, Edwin M. Stanton.
He tried to replace Edward Stanton.
Andrew Johnson
He romoved the secretary of war from his position without the approval of congress
The House of Representatives brought eleven articles of impeachment against President Andrew Johnson, most related to the violation of the Tenure of Office Act that occurred when Johnson attempted to remove Secretary of War Edwin M. Stanton from office.
Yes, President Andrew Johnson was directly involved with the Tenure of Office Act. He clashed with Congress over the Act, which was passed to restrict his ability to remove certain officeholders without Senate approval. Johnson violated the Act by dismissing Secretary of War Edwin Stanton, leading to his impeachment trial.
The date was February, 1868; the action was the dismissal of Edwin Stanton as Secretary of War.
President Andrew Johnson vetoed the Tenure of Office Act. It was, however, enacted over his veto in 1867, as a response to Johnson's attempt to suspend Edwin Stanton, his Secretary of War.
Johnson broke the law of the "Tenure of Office Act", which he felt was unconstitutional by replacing his Secretary of War with someone else. It seems that the Tenure of Office Act was intended to keep his Secretary of War in office, so Johnson's defiance of the Act was particularly 'flying in the face' of Congress' laws. Plus, Johnson was a southerner and was opposed to the acts of the very Republican Congress. The Senate failed by one vote to convict Johnson, so he was acquitted, and remained in office.
Andrew Johnson was impeached after he fired Secretary of War Edwin M. Stanton, violating the Tenure of Office Act.