President Bush has called nuclear terror the defining threat the United States now faces. Graham Allison of Harvard University's Kennedy School of Government argues that nuclear terror is preventable with a strategy based on the Three No's: no loose nukes, no nascent nukes, and no new nuclear states. Graham Allison is a leading analyst of U.S. national security and defense policy with a special interest in terrorism. This is the 16th Annual Margolis Lecture. (#12850)