Calvin Coolidge actually said...
I do hereby enjoin upon all officers of the United States charged with the execution of the laws thereof, the utmost diligence in preventing violations of the said Joint Resolution and this my Proclamation issued thereunder, and in bringing to trial and punishment I any offenders against the same.
Context
Proclamation—Exportation of Arms or Munitions of War to Mexico Unlawful
01/06/1924