Harry Truman actually said...
NOW, THEREFORE, by virtue of the authority vested in me by the Constitution and statutes, including Title I of the First War Powers Act, 1941 (55 Stat. 838), and as President of the United States, it is hereby ordered as follows
Context
Executive Order 9709—Providing Interim Arrangements Respecting Certain Air Navigation Facilities Abroad
03/28/1946