Furthermore, the traditional argument for war has focused on deterrence and containment. The war in Iraq, however, was undertaken on the principle of preventive war, now known as the Bush Doctrine. Schlesinger notes a long line of presidents who have rejected the preventive war argument. It includes no less a figure than Dwight D. Eisenhower, who said, "preventive war, to my mind, is an impossibility." Eisenhower had military caution in mind, but Schlesinger also points out another problem.