Iranian soldiers chant anti-Israeli and anti-US slogans during a ceremony marking the 36th anniversary of the return from exile of the founder of Iran's Islamic Republic, Ayatollah Ruhollah Khomeini on February 1, 2015 at Khomeini's mausoleum in a suburb of Tehran. Khomeini returned from exile in 1979, the trigger for a revolution which spawned an Islamic state now engulfed in a deep political crisis. AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)
US Secretary of State John Kerry (L) and Iran's Foreign Minister Mohammad Javad Zarif attend a bilateral meeting in Vienna, Austria, May 17, 2016.
/ AFP / POOL / LEONHARD FOEGER (Photo credit should read LEONHARD FOEGER/AFP/Getty Images)
TAMPA, FL - MARCH 14: Republican presidential candidate Donald Trump speaks to supporters during a town hall meeting on March 14, 2016 at the Tampa Convention Center in Tampa , Florida. Trump is campaigning ahead of the Florida primary on March 15. (Photo by Brian Blanco/Getty Images)
WASHINGTON, DC - AUGUST 06: Committee Chairman Sen. Bob Corker (R-TN) speaks on U.S. President Barack Obama's remarks on the Iran nuclear deal prior to a hearing held by the Senate Foreign Relations Committee August 6, 2015 in Washington, DC. The committee heard testimony on the "Review of the 2015 Trafficking in Persons Report." (Photo by Win McNamee/Getty Images)
