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Iranian President Hassan Rouhani addresses a press conference after registering his candidacy for the upcoming Assembly of Experts elections at the interior ministry in Tehran on December 21, 2015. The 86-member Assembly's role is to monitor the work of the supreme leader, currently Ayatollah Ali Khamenei. The poll will coincide in February 2016 with parliamentary elections, which could see more moderates and reformists chosen on the back of Iran's recent nuclear deal with world powers. AFP PHOTO / ATTA KENARE / AFP / ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)

Iranian President Hassan Rouhani addresses a press conference after registering his candidacy for the upcoming Assembly of Experts elections at the interior ministry in Tehran on December 21, 2015. The 86-member Assembly's role is to monitor the work of the supreme leader, currently Ayatollah Ali Khamenei. The poll will coincide in February 2016 with parliamentary elections, which could see more moderates and reformists chosen on the back of Iran's recent nuclear deal with world powers. AFP PHOTO / ATTA KENARE / AFP / ATTA KENARE        (Photo credit should read ATTA KENARE/AFP/Getty Images)