Iranian Foreign Minister Mohammad Javad Zarif speaks during a news conference earlier this month. Ahmad Al-Rubaye/AFP/Getty Images hide caption

itoggle caption Ahmad Al-Rubaye/AFP/Getty Images

Iran's President Hasan Rowhani, who was elected in June, has exchanged lettes with President Obama, the U.S. leader said in an interview that aired Sunday. Here, Rowhani speaks to Iran's Parliament in Tehran. Atta Kenare/AFP/Getty Images hide caption

itoggle caption Atta Kenare/AFP/Getty Images

Iran's newly elected president, Hasan Rowhani, gave a news conference in the capital Tehran on Monday. He said he would pursue a path of moderation. Ebrahim Noroozi/AP hide caption

itoggle caption Ebrahim Noroozi/AP

Hasan Rowhani gestures to his supporters at a rally in Tehram Iran, on June 1. The midranking cleric, Iran's president-elect, is seen as a political moderate. Ebrahim Noroozi/AP hide caption

itoggle caption Ebrahim Noroozi/AP