Defense Secretary Ash Carter testifies on Capitol Hill in Washington earlier this month. In an interview on CNN Sunday, Carter complained that Iraqi forces lacked "the will to fight" the self-declared Islamic State. Manuel Balce Ceneta/AP hide caption

itoggle caption Manuel Balce Ceneta/AP

Princeton University professor John Nash speaks during a news conference at the university in Oct. 1994 after being named the winner of the Nobel Prize for economics. Charles Rex Arbogast/AP hide caption

itoggle caption Charles Rex Arbogast/AP

Greek Prime Minister Alexis Tsipras (center) gestures next to Deputy Prime Minister Yannis Dragasakis (left) and Interior and Administrative Reconstruction Minister Nikos Voutsis. Voutsis says Greece may miss its next debt payment. Alkis Konstantinidis/Reuters/Landov hide caption

itoggle caption Alkis Konstantinidis/Reuters/Landov

The Bank of England in London in a photograph taken in March. The central bank inadvertently revealed that it was planning for a possible withdrawal of the U.K. from the European Union. Suzanne Plunkett/Reuters/Landov hide caption

itoggle caption Suzanne Plunkett/Reuters/Landov

Michael Brelo weeps as he hears the verdict in his trial Saturday, in Cleveland. Brelo, a patrolman charged in the shooting deaths of two unarmed suspects during a 137-shot barrage of gunfire was acquitted. Tony Dejak/AP hide caption

itoggle caption Tony Dejak/AP

Drag queen and gay rights activist Rory O'Neill, also known by the stage name, Panti, celebrates with supporters of same-sex marriage at Dublin Castle as they await the result of the referendum on Saturday. Paul Faith/AFP/Getty Images hide caption

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Policemen face protesters during a protest in central Bangkok on Friday. Thai authorities detained dozens of activists protesting against military rule on the first anniversary of a coup against the elected government. Damir Sagolj/Reuters/Landov hide caption

itoggle caption Damir Sagolj/Reuters/Landov

People examine the debris following a suicide bomb attack Friday at the Imam Ali mosque in the eastern village of al Qudaih in Saudi Arabia's Qatif province. A branch of the self-declared Islamic State has claimed responsibility for the attack. Reuters/Landov hide caption

itoggle caption Reuters/Landov

A bird covered in oil flaps its wings at Refugio State Beach, north of Goleta, Calif., on Thursday. More than 9,000 gallons of oil have been raked, skimmed and vacuumed from a spill that stretched across 9 miles of California coast, just a fraction of the sticky, stinking goo that escaped from a broken pipeline, officials said. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

In this photo released Thursday by a website run by Islamic State militants, damaged Syrian helicopters sit at Palmyra air base, which was captured by ISIS after a battle with the Syrian government forces earlier this week. Uncredited/AP hide caption

itoggle caption Uncredited/AP