Charles Dharapak

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In this Aug. 28, 2012, file photo, Rep. Ron Paul, R-Texas, arrives on the floor at the Republican National Convention in Tampa, Fla. (AP Photo/Charles Dharapak, File)

In this Nov. 21, 2013, file photo reviewed by the U.S. military, dawn arrives at the now closed Camp X-Ray at the Guantanamo Bay Naval Base in Cuba — a camp that was used as the first detention facility for al Qaeda and Taliban militants who were captured after the Sept. 11, 2001, attacks on the U.S. (AP Photo/Charles Dharapak, File)

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The Pentagon (AP Photo/Charles Dharapak, File)

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President Barack Obama shakes hands with Deputy Secretary of Defense Ash Carter after he spoke at the Nunn-Lugar Cooperative Threat Reduction (CTR) symposium being held at the National Defense University at Fort McNair in Washington, Monday, Dec. 3, 2012.(AP Photo/Charles Dharapak)

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President Barack Obama returns a Marine's salute as he boards Marine One on the South Lawn of the White House in Washington, Friday, Aug. 29, 2014, as he travels to Westchester County, N.Y., and Newport, R.I. (AP Photo/Charles Dharapak)

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Low short-term interest rates will be needed for a "considerable time," Federal Reserve Chair Janet Yellen told the Joint Economic Committee of Congress on May 7. (AP Photo/Charles Dharapak)

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Charles Dharapak, the chief White House photographer for The Associated Press, projects one of his AP photographs of President Barack Obama while speaking to editors and publishers at the Newspaper Association of America’s mediaXchange 2014 convention, in Denver, Tuesday, March 18, 2014. Dharapak talked about his experience of ongoing coverage limitations placed on news organizations by the Obama White House. (AP Photo/Brennan Linsley)