National Edition News cover for April 3, 2015 - Obama, Iran hail breakthrough on nuclear deal: From left, European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, Iranian Foreign Minister Javad Zarifat, an unidentified Russian official, look on as British Foreign Secretary Philip Hammond shakes hands with US Secretary of State John Kerry as they arrive at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)