Hillary Rodham Clinton

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Former Secretary of State Hillary Rodham Clinton told Diane Sawyer in an interview that the Benghazi controversy is even more of a reason to run for president in 2016. (AP Photo/Cliff Owen, File)

Vice President Joe Biden, right, swears in Secretary of State Hillary Rodham Clinton in a ceremonial swearing-in at the Sate Department, Monday, Feb. 2, 2009, in Washington. Joining Clinton is her husband, former President Bill Clinton, second from left, their daughter Chelsea Clinton. (AP Photo/Lawrence Jackson)

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** FILE ** This May 14, 2014, file photo shows former Secretary of State Hillary Rodham Clinton speaking in Washington. (AP Photo/Cliff Owen, File)

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FILE - In this Jan. 29, 2013 file photo, Secretary of State Hillary Rodham Clinton adjusts her glasses during a Global Townterview at the Newseum in Washington. Clinton says in an excerpt from her upcoming book that she wishes she could go back and revisit some of her decisions but she is "proud of what we accomplished" at the State Department. (AP Photo/Pablo Martinez Monsivais)

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Former Secretary of State Hillary Rodham Clinton addresses the American Jewish Committee (AJC) Global Forum closing plenary in Washington, Wednesday, May 14, 2014. (AP Photo/Cliff Owen)