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General Keith Alexander, Director of the National Security Agency, listens during a hearing of the Senate Judiciary on Capitol Hill October 2, 2013 in Washington, DC.
General Keith Alexander, Director of the National Security Agency, listens during a hearing of the Senate Judiciary on Capitol Hill October 2, 2013 in Washington, DC.

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    Greenwald pushes back against NSA

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Greenwald pushes back against NSA

CNN's Christiane Amanpour speaks with Glenn Greenwald about the U.S. intelligence chiefs' testimony before Congress.

Greenwald pushes back against NSA

CNN's Christiane Amanpour speaks with Glenn Greenwald about the U.S. intelligence chiefs' testimony before Congress.