Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, prepares to answer questions from lawmakers on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee. It is his first public appearance before Congress since revelations that the electronic surveillance agency is sweeping up Americans' phone and Internet records in its quest to investigate terrorist threats. At right is Rand Beers, under secretary for the Department of Homeland Security. (AP Photo/J. Scott Applewhite)

Associated Press
Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, prepares to answer questions from lawmakers on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee. It is his first public appearance before Congress since revelations that the electronic surveillance agency is sweeping up Americans' phone and Internet records in its quest to investigate terrorist threats. At right is Rand Beers, under secretary for the Department of Homeland Security.  (AP Photo/J. Scott Applewhite)
Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, prepares to answer questions from lawmakers on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee. It is his first public appearance before Congress since revelations that the electronic surveillance agency is sweeping up Americans' phone and Internet records in its quest to investigate terrorist threats. At right is Rand Beers, under secretary for the Department of Homeland Security. (AP Photo/J. Scott Applewhite)
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