National Security Agency

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**FILE** Senate Judiciary Committee Chairman Patrick Leahy (right), Vermont Democrat, and the committee's ranking Republican, Chuck Grassley of Iowa, arrive on Capitol Hill on July 31, 2013, as the panel questioned top Obama administration officials about the National Security Agency's surveillance programs for the first time since the House narrowly rejected a proposal last week to effectively shut down the NSA's secret collection of hundreds of millions of Americans' phone records. (Associated Press)

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** FILE ** In this July 30, 2013, file frame grab from Rossiya 24 television channel, Lon Snowden, the father of National Security Agency leaker Edward Snowden, speaks during an interview with Russian the state-owned Rossiya 24 television in Washington. (AP Photo/Rossiya 24 via APTN, File)

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** FILE ** National Security Agency leaker Edward Snowden (center) attends a meeting with Russian activists and officials at Sheremetyevo Airport in Moscow on Friday, July 12, 2013. (AP Photo/Tatyana Lokshina, Human Rights Watch)

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** FILE ** A TV screen shows a news report of Edward Snowden, a former National Security Agency contractor who leaked top-secret documents about sweeping U.S. surveillance programs, at a shopping mall in Hong Kong Sunday, June 23, 2013. (AP Photo/Vincent Yu)

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