Director of National Intelligence James Clapper testifies during a hearing before Senate Select Intelligence Committee on Wednesday. Alex Wong/Getty Images hide caption

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Surveillance camera video of Aaron Alexis, a contractor who killed 12 people at the Washington Navy Yard on Sept. 16, 2013. Alexis was one of thousands of individuals cleared by the firm known as USIS. HO/UPI/Landov hide caption

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The NSA used a program codenamed Dishfire to collect text messages worldwide that were then used to extract location and financial data, according to The Guardian. Here, women use their cellphones in Los Angeles earlier this month. Frederic J. Brown/AFP/Getty Images hide caption

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The NSA can reportedly monitor what's going on with 100,000 computers around the world. Gregorio Borgia /AP hide caption

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From 'Morning Edition': NPR's Carrie Johnson on the hearing about the NSA's surveillance programs

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The National Security Agency headquarters building in Fort Meade, Md. Reuters/Landov hide caption

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NSA Says It Would Welcome Public Advocate At FISA Court

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The National Security Agency headquarters at Fort Meade, Md. The agency has been trying to build a quantum computer, The Washington Post reports — but that news doesn't surprise experts in the field. Saul Loeb/Getty Images hide caption

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The NSA's Quantum Code-Breaking Research Is No Secret

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