President Barack Obama says the nuclear deal with Iran builds on the tradition of strong US diplomacy that won the Cold War without firing any shots. Obama is comparing the agreement to President John F. Kennedy’s call for Cold War diplomacy and nuclear disarmament. He says not every conflict was averted, but the world avoided nuclear catastrophe. Obama is arguing in support of the deal in a speech at American University in Washington. He’s working to dissuade lawmakers in Congress from trying to stop the agreement.