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 the aforesaid Migratory Bird Treaty Act of July 3, 1918, do hereby approve and proclaim the foregoing regulation of the Under Secretary of the Interior.
Context
Proclamation 2730—Amendment of Regulation Relating to Migratory Birds and Game Mammals
04/30/1947