Iran nuclear deal

After Iran shot down a U.S. drone, President Trump speculated that "it could have been someone loose and stupid" behind the surface-to-air missile strike. The president spoke about the issue on Thursday as Secretary of State Mike Pompeo (center) and White House national security adviser John Bolton looked on in the Oval Office. Jonathan Ernst/Reuters hide caption

Atomic Energy Organization of Iran spokesman Behrouz Kamalvandi, pictured at a July 2018 news conference in Tehran, said Monday: "We have quadrupled the rate of enrichment and even increased it more recently." Atta Kenare/AFP/Getty Images hide caption

Iranian President Hassan Rouhani says Iran will begin keeping its excess uranium and heavy water, and he set a 60-day deadline for new terms to its nuclear deal before the country will resume higher uranium enrichment. Rouhani is seen here at a cabinet meeting in Tehran on Wednesday. Iranian Presidency Office/AP hide caption

German Chancellor Angela Merkel and U.S. Vice President Pence talk at the Munich Security Conference on Saturday. Alexandra Beier/Getty Images hide caption

People withdraw money from a bank machine in the Iranian capital Tehran's Grand Bazaar in November, months after President Trump announced in May he was withdrawing from the 2015 Iran nuclear deal and reimposing sanctions on the country. Atta Kenare/AFP/Getty Images hide caption

People walk at the old main bazaar in Tehran, Iran, last month. The strained Iranian economy is bracing for the impact of new U.S. sanctions that went into effect Tuesday. Ebrahim Noroozi/AP hide caption

Secretary of State Mike Pompeo attends a news conference on the sidelines of the 51st ASEAN Foreign Ministers Meeting in Singapore, on Saturday. Joseph Nair/AP hide caption

Hua Qu, the wife of Chinese-American Xiyue Wang, poses with a portrait of her family in Princeton, N.J., on May 9. Families of Americans detained in Iran are hoping President Trump's decision to withdraw from the Iran nuclear deal will not make it harder to get their love ones freed. Matt Rourke/AP hide caption

The sun sets behind an oil pump in the desert oil fields of Sakhir, Bahrain. OPEC nations agreed to reduce their production, but energy experts say that renewed U.S. sanctions on Iran could derail their supply cut deal. Hasan Jamali/AP hide caption

U.S. Ambassador to Germany Richard Grenell (left) and German President Frank-Walter Steinmeier greet the media during Grenell's accreditation process at the Bellevue Palace in Berlin on Tuesday. Michael Sohn/AP hide caption