Former U.S. National Security Agency contractor Edward Snowden appears live via video during a student organized world affairs conference at the Upper Canada College private high school in Toronto in February. Mark Blinch/Reuters/Landov hide caption

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A man using a mobile phone walks past an AT&T store, in June. The New York Times and ProPublica report that the telecom giant helped the NSA spy for decades. Mark Lennihan/AP hide caption

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Edward Snowden is shown during a live broadcast from Moscow at the CeBIT in Hanover, Germany, in March. On Friday, Snowden said a federal court ruling against the NSA program that he revealed was "extraordinarily encouraging." Ole Spata/DPA/Landov hide caption

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Alan Rusbridger said today that he will step down as editor in chief of the Guardian next summer. Rusbridger oversaw the U.K. newspaper's publication of Edward Snowden's leak of classified material. Alastair Grant/AP hide caption

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Central Intelligence Agency Director John Brennan takes questions after addressing the Council on Foreign Relations on March 11. The CIA has proposed deleting the email of almost all employees after they leave the agency. But some critics are saying a larger portion of the email should be preserved. Chip Somodevilla/Getty Images hide caption

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The CIA Wants To Delete Old Email; Critics Say 'Not So Fast'

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This photo provided by The Guardian in London shows Edward Snowden, who worked as a contract employee at the National Security Agency, in Hong Kong last year. AP hide caption

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Big Data Firm Says It Can Link Snowden Data To Changed Terrorist Behavior

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Director of National Intelligence James Clapper (center), accompanied by FBI Director Robert Mueller (left) and CIA Director John Brennan, testifies on Capitol Hill on March 12, 2013. When questioned, Clapper said the NSA did not collect data on Americans. He later acknowledged his response was "clearly erroneous." Susan Walsh/AP hide caption

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The Challenge Of Keeping Tabs On The NSA's Secretive Work

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Over the last dozen years, whistleblowers at the National Security Agency have had a rough track record, facing FBI raids and lawsuits. NSA/Reuters/Landov hide caption

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Before Snowden: The Whistleblowers Who Tried To Lift The Veil

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The Associated Press reports that the U.S. knew the British government would oversee the destruction of hard drives held by the Guardian newspaper that contained sensitive information. Raphael Satter/AP hide caption

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Speaker John Boehner prepares to speak to the media after the House passed the USA Freedom Act, an NSA reform bill aimed at restricting access to Americans' phone records. Jim Lo Scalzo/EPA/Landov hide caption

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