A Russian warplane taxies at Hemeimeem airbase in Syria. Advocates say a no-fly zone would keep Syrian aircraft from attacking anti-government rebels and endangering civilians, which might allow Syrians to feel safe enough to stay put. Vladimir Isachenkov/AP hide caption

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After their villages were overrun by ISIS last year, hundreds of Yazidis sought safety on Mount Sinjar, a place they consider miraculous. Many families, including this one, refuse to leave the mountain. Alison Meuse/NPR hide caption

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"In the eyes of the Arabs in Turkey, ISIL is a completely different threat than Saddam Hussain, than the Taliban. They're the neighbor from hell," said Sen. Lindsey Graham. Jim Cole/AP hide caption

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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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