Iran and U.S. Iran and U.S.

Iranian Quds Force commander Maj. Gen. Qassem Soleimani attends Iranian supreme leader Ayatollah Ali Khamenei's (not seen) meeting with the Islamic Revolution Guards Corps in Tehran in 2016. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

In this photo released by the official website of the Iranian presidency, President Hassan Rouhani attends a meeting with a group of Foreign Ministry officials in Tehran on Sunday. Rouhani warned President Donald Trump against provoking his country while indicating peace between the two nations might still be possible. Iranian Presidency Office via AP hide caption

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Iranian Presidency Office via AP

Secretary of State Rex Tillerson speaks at a 2017 Trafficking in Persons Report ceremony at the State Department, in June. On Monday, Tillerson recertified Iran's compliance with the 2015 nuclear deal. Jacquelyn Martin/AP hide caption

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Jacquelyn Martin/AP