Former Iranian nuclear negotiator Hasan Rowhani, center, arrives at the interior ministry to register his candidacy for the upcoming presidential election, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns. (AP Photo/Vahid Salemi)

Associated Press
Former Iranian nuclear negotiator Hasan Rowhani, center, arrives at the interior ministry to register his candidacy for the upcoming presidential election, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns. (AP Photo/Vahid Salemi)
Former Iranian nuclear negotiator Hasan Rowhani, center, arrives at the interior ministry to register his candidacy for the upcoming presidential election, in Tehran, Iran, Tuesday, May 7, 2013. Iranian authorities opened the registration process Tuesday for candidates in next month's presidential election that will pick a successor to President Mahmoud Ahmadinejad and offer a critical test for reformists battered after years of crackdowns. (AP Photo/Vahid Salemi)
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