Harry Truman actually said...

"I don't write legislation."

"The foreign policy has been inaugurated by the President of the United States, and carried out by the Secretary of State, and nobody else."

"I made my position perfectly clear in the message, and the whole legislative end of the thing is with the Congress."

"Mr. Franklin was one of the assistants in preparing speeches during the campaign, but I never had one private interview with him at all, on any subject."