"Allow the President to invade a neighboring nation whenever he shall deem it necessary to repel an invasion and you allow him to do so whenever he may choose to say he deems it necessary for such purpose, and you will allow him to make war at pleasure...If today he thinks it necessary to invade Canada to prevent the British from invading us, how could you stop him? You may say to him 'I see no probability of the British invading us' but he will say, 'Be silent, I see it if you don't.'"
Abraham Lincoln in a letter to his law partner, Thomas Herndon.
