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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Susan Walsh/AP

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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NSA/Reuters/Landov

Before Snowden: The Whistleblowers Who Tried To Lift The Veil

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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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Saul Loeb/Getty Images

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

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Your call may be monitored: The NSA has been given the OK to collect data about millions of Americans' phone calls (though not about the conversations). Glen Argov /Landov hide caption

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Glen Argov /Landov

From 'Morning Edition': NPR's Dina Temple-Raston on the collection of phone records

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