"The provision of the Constitution giving the war making power to Congress was dictated, as I understand it, by the following reasons: Kings had always been involving and impoverishing their people in wars, pretending generally, if not always, that the good of the people was the object. This our convention understood to be the most oppressive of all kingly oppressions, and they resolved to so frame the Constitution that no one man should hold the power of bringing this oppression upon us. But your view destroys the whole matter, and places our President where kings have always stood,"
- Abraham Lincoln, in a letter to William H. Herndon, Feb. 15, 1848.
Logic that should have ruled the day before the invasion of Iraq, and must rule the day before any action is taken against Iran.
Source: Andrew Sullivan.