Bruce Bueno de Mesquita of Stanford University's Hoover Institution and New York University talks to EconTalk host Russ Roberts about threats to U.S. security, particularly Iran. Bueno de Mesquita argues that Iran is of little danger to the United States. He then looks at what Iran has to gain and to lose by appearing to build a nuclear weapons program and actually using a nuclear weapon. He then goes on to examine the nature of other threats to the United States. The closing topic of the conversation is the peculiar incentives facing U.S. Presidents as their terms expire.