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

Zeinab Sekaanvand, 22, faces execution for allegedly killing her husband. Amnesty International believes she did not get a fair trial. Amnesty International hide caption

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Amnesty International

A destroyed vehicle bearing a radar antenna is pictured in the Yemeni port city of Hodeidah on Oct. 13. The U.S. military directly targeted Yemen's Houthi rebels for the first time, hitting radar sites controlled by the insurgents after U.S. warships came under missile attacks twice in four days. Stringer/AFP/Getty Images hide caption

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Stringer/AFP/Getty Images

Richard Ratcliffe, second from right, delivers a petition to the British prime minister's official residence calling on Iran to release his wife, Nazanin Zaghari-Ratcliffe. She was stopped in April at the airport in Tehran with the couple's 2-year-old daughter as they tried to return to Britain after a family holiday. Ratcliffe was at the United Nations this week appealing for their release. Carl Court/Getty Images hide caption

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Carl Court/Getty Images

As Iran's President Touts Openness, Britons Appeal For Release Of Prisoners

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An Iran Air Boeing 747 passenger plane sits on the tarmac of the domestic Mehrabad airport in the Iranian capital Tehran in 2013. Behrouz Mehri /AFP/Getty Images hide caption

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Behrouz Mehri /AFP/Getty Images

Shahram Amiri, an Iranian nuclear scientist, attends a news briefing while holding his son Amir Hossein as he arrives at the Imam Khomeini airport just outside Tehran, Iran, after returning from the United States in 2010. Vahid Salemi/AP hide caption

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Vahid Salemi/AP