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Iranian President Hassan Rouhani delivers a speech under portraits of Iran's supreme leader, Ayatollah Ali Khamenei (L) and Iran's founder of the Islamic Republic, Ayatollah Ruhollah Khomeini (R), on the eve of the 25th anniversary of the Islamic revolutionary leader Ayatollah Ruhollah Khomeini's death, at his mausoleum in a suburb of Tehran on June 3, 2014. AFP PHOTO / ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)
Iranian President Hassan Rouhani delivers a speech under portraits of Iran's supreme leader, Ayatollah Ali Khamenei (L) and Iran's founder of the Islamic Republic, Ayatollah Ruhollah Khomeini (R), on the eve of the 25th anniversary of the Islamic revolutionary leader Ayatollah Ruhollah Khomeini's death, at his mausoleum in a suburb of Tehran on June 3, 2014. AFP PHOTO / ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)

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CNN's Jim Sciutto speaks with Brett McGurk about Iran's Supreme Leader casting doubt on the nuclear deal.