Officials cut off water to San Quentin State Prison in California to squelch a Legionnaires' disease outbreak. Robert Galbraith/Reuters/Landov hide caption

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Republican presidential candidate Donald Trump waves to the crowd after speaking at the National Federation of Republican Assemblies on Saturday, Aug. 29, 2015, in Nashville, Tenn. Mark Humphrey/AP hide caption

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Rep. Elijah Cummings (second from right), the ranking member of the House Select Committee on Benghazi, said it's "certainly understandable" that Bryan Pagliano would be advised not to appear before the committee. J. Scott Applewhite/AP hide caption

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A woman looks on at the U.S. Capitol in 2013 after the most recent government shutdown. Congress has made no progress toward avoiding a government shutdown when it will run out of funding Sept. 30. Jacquelyn Martin/AP hide caption

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Rowan County Clerk Kim Davis (right) talks with David Moore on Tuesday morning following her refusal to issue a marriage license to him and his partner at the Rowan County Courthouse in Morehead, Ky. Timothy D. Easley/AP hide caption

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The view at daybreak in Bosque del Apache, N.M. John Fowler/Flickr hide caption

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Donald Trump and Jeb Bush were polite to each other at the first GOP debate. But it's been gloves off since then, especially on Instagram, a social media outlet not known for its vitriol. Andrew Harnik/AP hide caption

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Squirrels closely mimic bird warning calls and help spread the alarm through the forest that hawks, owls or other predators are nearby. iStockphoto hide caption

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