British Chancellor of the Exchequer George Osborne, the United Kingdom's head financial official, leaves after making a statement at the Treasury in London on Monday. Stefan Rousseau/AFP/Getty Images hide caption

U.S. Secretary of State John Kerry (right), along with British Foreign Secretary Philip Hammond (left), speak to reporters in London on May 12. They tried to assure European banks they won't be penalized for conducting legitimate business with Iran. Critics say it should not be up to the U.S. to encourage investment in Iran. Josh Lederman/AP hide caption

Secretary of State John Kerry pauses during his remarks about seeing the Hiroshima Peace Memorial Park and Museum, the site of the 1945 atomic bombing, during a news conference at the conclusion of the G-7 Foreign Ministers' Meetings in Hiroshima on Monday. Jonathan Ernst/AFP/Getty Images hide caption

Sec. State John Kerry spoke with NPR's Steve Inskeep at the State Department. Kainaz Amaria/NPR hide caption

Secretary of State John Kerry spoke with NPR's Steve Inskeep at the State Department. Kerry said if Congress or a future president reverses a nuclear control agreement with Iran, U.S. credibility will suffer. Kainaz Amaria/NPR hide caption

U.S. Secretary of State John Kerry (left) and Saudi Foreign Minister Adel al-Jubeir held a joint news conference Thursday in Riyadh, Saudi Arabia. Andrew Harnik/AP hide caption

U.S. Secretary of State John Kerry speaks at a news conference in Sharm el-Sheikh, Egypt, on Saturday. Kerry said he's returning to nuclear negotiations with Iran with "important gaps" standing in the way of a deal. Brian Snyder/AP hide caption

Senate intelligence committee chairwoman Sen. Dianne Feinstein, D-Calif., is again defending her report on CIA torture methods, which was set to be released this week. J. Scott Applewhite/AP hide caption

At a Cairo aid conference to help rebuild Gaza, Secretary of State John Kerry paused to rub his eyes Sunday. The U.S. is promising another $212 million in aid. Carolyn Kaster/AP hide caption

Egyptian President Abdel-Fattah el-Sissi and U.S. Secretary of State John Kerry talk before a meeting at the Presidential Palace on Sunday in Cairo. Brendan Smialowski/AFP/Getty Images hide caption

Russian Foreign Minister Sergei Lavrov, left, and U.S. Secretary of State John Kerry before their talks Friday in London. Afterward, they reported no breakthroughs on finding a solution to the crisis in Ukraine. Brendan Smialowski/AP hide caption