Harry Truman actually said...
By virtue of the power and authority vested in me by the Constitution and laws of the United States, particularly by Title III of the Second War Powers Act, 1942, as amended, as President of the United States and Commander in Chief of the Army and Navy, it is hereby ordered as follows:
Context
Executive Order 9729—Further Defining the Functions and Duties of the Office of Defense Transportation
05/22/1946