Tenure of Office Act (1867)
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The Tenure of Office Act was a United States federal law (in force from 1867 to 1887) that was intended to restrict the power of the President of the United States to remove certain office-holders without the approval of the Senate. The law was enacted on March 3, 1867, over the veto of President Andrew Johnson. It purported to deny the president the power to remove any executive officer who had been appointed by the president, with the advice and consent of the Senate, unless the Senate approved the removal during the next full session of Congress. Congress repealed the act in its entirety in 1887. 
In the post-Civil War political environment, President Andrew Johnson endorsed the quick re-admission of the Southern secessionist states. The two-thirds Republican majorities of both houses of Congress, however, passed laws over Johnson's vetoes, establishing a series of five military districts overseeing newly created state governments. This "Congressional Reconstruction" was designed to create local civil rights laws to protect newly freed slaves; to protect and patrol the area; to ensure the secessionist states would show some good faith before being readmitted; to ensure Republican control of the states; and, arguably, to inflict some punishment on the secessionists. States would be readmitted gradually.
Overpowered politically, the sole check Johnson could apply to the Congressional Reconstruction plan was through his control, as commander-in-chief of the military, which would be the primary means by which to enforce the plan's provisions. However, even Johnson's control of the military was inhibited by the fact that his Secretary of War, Edwin Stanton, was a staunch Radical Republican who supported Congressional Reconstruction in full. This further set Johnson against the Republican-controlled Congress, with Johnson wanting to remove Stanton from office and Congress wanting to keep him in place.
Stanton and impeachment
The Tenure of Office Act restricted the President to suspend an officer while the Senate was not in session—at that time, Congress sat during a relatively small portion of the year. If, when the Senate reconvened, it declined to ratify the removal, the President would be required to reinstate the official.
In August 1867, with the Senate out of session, Johnson made his move against Stanton, suspending him pending the next session of the Senate. However, when the Senate convened on January 4, 1868, it refused to ratify the removal by a vote of 35-16. Notwithstanding the vote, President Johnson attempted to appoint a new Secretary of War. Proceedings began within days, leading to Johnson's impeachment, the first impeachment of a United States President. After a three-month trial, Johnson avoided removal from office by the Senate by a single vote. Stanton resigned in May 1868.
It was actually unclear whether Johnson had violated the Tenure of Office Act. The act's phrasing was murky, and it was not clear whether his removal of Stanton (a holdover from the Lincoln administration whom Johnson had not appointed) violated the Act. While the Act, by its terms, applied to current office holders, it also limited the protection offered to Cabinet members to one month after a new president took office.
In 1926, a similar law (though not dealing with Cabinet secretaries) was ruled unconstitutional by the United States Supreme Court in the case of Myers v. United States, which affirmed the ability of the President to remove a Postmaster without Congressional approval. In reaching that decision, the Supreme Court stated in its majority opinion (though in dicta), "that the Tenure of Office Act of 1867, insofar as it attempted to prevent the President from removing executive officers who had been appointed by him by and with the advice and consent of the Senate, was invalid".