John Kerry

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Students listen as Secretary of State John Kerry delivers the Class Day address at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Miriam Rock of Philadelphia, left, and Jack Shu of Potomac, Md., right, react as Secretary of State John Kerry delivers the Class Day address at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Secretary of State John Kerry, right poses for a selfie with Yale student Ariel Kirshenbaum during Class Day at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Secretary of State John Kerry delivers the Class Day address at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Secretary of State John Kerry speaks during his news conference at the Foreign Office in London, Thursday, May 15, 2014. House Oversight Committee Chairman Rep. Darrell Issa, R-Calif. has reissued his subpoena demanding that Kerry testify about documents provided to Congress about the deadly 2012 attack in Benghazi, Libya. (AP Photo/Jacquelyn Martin, Pool)