Harry Truman actually said...
Now, Therefore, I, Harry S. Truman, President of the United States of America, under and by virtue of the authority vested in me by section 3 of the said migratory Bird Treaty Act of July 3, 1918, do hereby approve and proclaim the foregoing regulation.
Context
Proclamation 2817—Closed Area Under the Migratory Bird Treaty Act, Massachusetts
10/17/1948