A shackled detainee is transported by guards, including a female soldier, at Camp Delta detention center, Guantanamo Bay U.S. Naval Base, Cuba, in this photo from December 2006. Brennan Linsley/AP hide caption

itoggle caption Brennan Linsley/AP

The entrance to Camp 5 and Camp 6 at the U.S. military's Guantanamo Bay detention center at Guantanamo Bay Naval Base, Cuba, in a photograph taken in 2014. Ben Fox/AP hide caption

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President Obama speaks beside Russian President Dmitry Medvedev after signing New START documents in 2010. Now five years old, that treaty has taken on renewed relevance in light of the framework nuclear deal between the U.S. and Iran. Joe Klamar/AFP/Getty Images hide caption

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Sen. Bob Corker, R-Tenn., chairman of the Senate Foreign Relations Committee, will shepherd bills on Congress' reaction to the Iran framework deal struck by President Obama. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Sgt. Bowe Bergdahl prepares to be interviewed by Army investigators in August 2014. Eugene R. Fidell/AP hide caption

itoggle caption Eugene R. Fidell/AP