U.S. Secretary of State Rex Tillerson, pictured in Moscow last week, says Iran has been abiding by a 2015 nuclear agreement. But he told Congress in a letter that the Trump administration was reviewing the lifting of U.S. sanctions against Iran to determine if that was in U.S. interests. Ivan Sekretarev/AP hide caption

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Ivan Sekretarev/AP

Former President Mahmoud Ahmadinejad raises his hand Wednesday as he registers to run in Iran's presidential election next month. Atta Kenare/AFP/Getty Images hide caption

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Atta Kenare/AFP/Getty Images

Bahar fled to Iraq after facing harassment in Iran. "I was hoping so much that I could get my flight to America before the crackdown resumed," he says. "So far, there's no way forward for me, I'm stuck." Courtesy of Papal Ahmadzadeh hide caption

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Courtesy of Papal Ahmadzadeh

An Emad ballistic missile is displayed by the Revolutionary Guard during a September 2016 military parade in front of the shrine of Iran's revolutionary founder Ayatollah Khomeini, just outside Tehran. Iranian Foreign Minister Mohammad Javad Zarif has said Iran's missile program is not part of a 2015 landmark nuclear deal between his country and world powers. Ebrahim Noroozi/AP hide caption

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Ebrahim Noroozi/AP

Iranian Foreign Minister Mohammad Javad Zarif said Tuesday that Iran's missile program is purely defensive. The U.S. announced new sanctions on individuals and companies it says support Iran's ballistic missile program. Vahid Salemi/AP hide caption

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Vahid Salemi/AP

House Speaker Paul Ryan meets with reporters on Thursday. He said he would support additional sanctions on Iran following a ballistic missile test over the weekend. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

Missiles on display in northern Tehran in 2014. A reported missile test by Iran on Sunday has led some American officials to accuse the country of violating a U.N. resolution that accompanied the 2015 nuclear deal. Atta Kenare/AFP/Getty Images hide caption

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Atta Kenare/AFP/Getty Images

Mourners attend the funeral of former Iranian President Ali Akbar Hashemi Rafsanjani on Tuesday. Rafsanjani, who was 82, was a key figure in the foundation of the Islamic Republic in 1979, and served as president from 1989 to 1997. Majid Saeedi/Getty Images hide caption

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Majid Saeedi/Getty Images

Akbar Hashemi Rafsanjani, during a 2015 meeting with Germany's foreign minister in Tehran. Thomas Koehler/Photothek via Getty Images hide caption

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Thomas Koehler/Photothek via Getty Images

Former Iranian President Rafsanjani, A Leading Voice For Reform, Dies At 82

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In Moscow, Russian Foreign Minister Sergey Lavrov (right) and Turkey's Foreign Minister Mevlut Cavusoglu offer flowers in memory of Andrei Karlov, Russia's ambassador to Turkey. Karlov was fatally shot Monday in Ankara. Maxim Shemetov/AP hide caption

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Maxim Shemetov/AP