Over turn the 1868 Impeachment of Andrew Johnson

On the grounds that the (Tenure of Office Act of 1867) was ruled unconstitutional by the United States Supreme Court.
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".[