Justice Jackson, from the Youngstown Sheet & Tube case.*
"[N]o doctrine that the Court could promulgate would seem to me more sinister or alarming than that a President whose conduct of foreign affairs is so largely uncontrolled, and often even is unknown, can vastly enlarge his mastery over the internal affairs of the country by his own commitment of the Nation's armed forces to some foreign venture."
*In Youngstown, President Truman reacted to a prospective labor strike in the nation's steel mills by seizing control of the mills by executive order. At the time, U.S. troops were engaged in a UN police action in Korea.