Respectfully Quoted: A Dictionary of Quotations. 1989.
William Howard Taft (18571930)
The President can exercise no power which cannot be fairly and reasonably traced to some specific grant of power in the Federal Constitution or in an act of Congress passed in pursuance thereof. There is no undefined residuum of power which he can exercise because it seems to him to be in the public interest.
WILLIAM HOWARD TAFT, Our Chief Magistrate and His Powers, chapter 6, pp. 13940 (1916).