Think of what happened after 9/11, the minute before there was any assessment, there was glee in the administration because now we can invade Iraq, and so the war drums beat. ↗
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 a purpose - and you allow him to make war at pleasure. ↗