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TEHRAN, IRAN - MAY 19: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'IRANIAN PRESIDENCY / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Iran's current President and presidential candidate Hassan Rouhani casts his ballot at Husayniyyah-yi Irshad polling station during Iran's 12th presidential election, in Tehran, Iran on May 19, 2017. (Photo by Presidency of Iran / Handout/Anadolu Agency/Getty Images)

TEHRAN, IRAN - MAY 19: (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'IRANIAN PRESIDENCY / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Iran's current President and presidential candidate Hassan Rouhani casts his ballot at Husayniyyah-yi Irshad polling station during Iran's 12th presidential election, in Tehran, Iran on May 19, 2017. (Photo by Presidency of Iran / Handout/Anadolu Agency/Getty Images)

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TEHRAN, IRAN - MAY 19: Iranian cleric and presidential candidate Ebrahim Raisi casts his ballot during Iran's 12th presidential election, at Irshad Mosque in Shahr-e-Ray county of Tehran, Iran on May 19, 2017. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)

TEHRAN, IRAN - MAY 19: Iranian cleric and presidential candidate Ebrahim Raisi casts his ballot during Iran's 12th presidential election, at Irshad Mosque in Shahr-e-Ray county of Tehran, Iran on May 19, 2017. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)

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TEHRAN, IRAN - MAY 19: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'IRANIAN PRESIDENCY / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Iran's current President and presidential candidate Hassan Rouhani greets voters as he arrives Husayniyyah-yi Irshad polling station to cast his ballot during Iran's 12th presidential election, in Tehran, Iran on May 19, 2017. (Photo by Presidency of Iran / Handout/Anadolu Agency/Getty Images)

TEHRAN, IRAN - MAY 19: (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'IRANIAN PRESIDENCY / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Iran's current President and presidential candidate Hassan Rouhani greets voters as he arrives Husayniyyah-yi Irshad polling station to cast his ballot during Iran's 12th presidential election, in Tehran, Iran on May 19, 2017. (Photo by Presidency of Iran / Handout/Anadolu Agency/Getty Images)