Sinjar city, newly freed from ISIS control by U.S.-backed Kurdish forces, lies in ruins. Alison Meuse/NPR hide caption

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People remove household goods from the rubble as a house burns on Sunday in Sinjar, Iraq. Kurdish forces, with the aid of months of U.S.-led coalition airstrikes, liberated the town from ISIS. John Moore/Getty Images hide caption

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Some legal scholars disagree with former Secretary of State Hillary Clinton's claim that the U.S. has the power to fight ISIS under a 2001 military authorization. Mandel Ngan/AFP/Getty Images hide caption

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Fact Check: Hillary Clinton On Using Force Against ISIS

In Saturday's Democratic debate, Clinton said the U.S. has the authority to fight ISIS. But not everyone agrees on that.

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Kurdish peshmerga forces enter the northern Iraqi town of Sinjar on Friday after pushing out the Islamic State. The town is home to the Yazidi minority; many displaced members of the group say they are wary of returning home. They fear they could still be targeted by neighboring communities that supported the Islamic State. Safin Hamed/AFP/Getty Images hide caption

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Former President George H.W. Bush pumps his fist next to his son, Jeb, during a fundraiser in Tampa, Fla., in 1994. Jeb Bush was running for governor. He lost that year, but won four years later. Chris O'Meara/AP hide caption

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Ahmed Chalabi in 2010. Karim Kadim/ASSOCIATED PRESS hide caption

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A car departs from Volkswagen's factory and company headquarters in Wolfsburg, Germany. The company says the fallout from its diesel emissions scandal is still becoming clear, as it reports a large quarterly loss. Sean Gallup/Getty Images hide caption

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President Obama salutes prior to boarding Air Force One last Friday. The president entered office saying he would end the U.S. role in the Iraq and Afghan wars. But U.S. forces were sent back to Iraq last year and he announced Thursday that 5,500 American troops would remain in Afghanistan beyond their previously planned departure at the end of 2016. Pablo Martinez Monsivais/AP hide caption

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