National Security Agency

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** FILE ** National Security Agency (NSA) Director Gen. Keith B. Alexander testifies on Capitol Hill in Washington, Tuesday, June 18, 2013, before the House Intelligence Committee. (Associated Press)

Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, testifies on Capitol Hill in Washington on June 18, 2013, before the House Permanent Select Committee on Intelligence. (Associated Press)

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Gen. Keith B. Alexander, director of the National Security Agency, approaches the witness table on Capitol Hill in Washington on June 18, 2013, to testify before the House Intelligence Committee hearing regarding the agency's surveillance. (Associated Press)

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**FILE** Gen. Keith B. Alexander, commander of the U.S. Cyber Command and director of the National Security Agency, testifies on Capitol Hill in Washington on June 12, 2013. (Associated Press)

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Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, said on Wednesday he would discuss specific foiled terrorist plots in more detail Thursday during a closed congressional hearing on the NSA leak. (Associated Press)