By direction of the President, it is ordered that Major-General McClellan be relieved from the command of the Army of the Potomac, and that Major-General Burnside take the command of that army; also that Major-General Hunter take command of the corps in said army which is now commanded by General Burnside; that Major-General Fitz John Porter be relieved from the command of the corps he now commands in said army, and that Major-General Hooker take command of said corps.
The General in Chief is authorized, in (his) discretion, to issue an order substantially as the above forthwith, or so soon as he may deem proper.
A. LINCOLN.
Abraham Lincoln, Executive Order—Relieving General G. B. McClellan and Making Other Changes Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/202666