FBI Director James Comey testifies on Capitol Hill in Washington on Nov. 14, 2013. Speaking to reporters Thursday, Comey said he's "confused" by reports that characterize NSA contractor Edward Snowden as a "whistleblower" or a "hero." Carolyn Kaster/AP hide caption

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FBI Director James Comey is pictured earlier this month during his swearing-in ceremony at the Justice Department in Washington, D.C. Susan Walsh/AP hide caption

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Newly minted FBI Director James Comey speaks at a swearing-in ceremony last week at the Justice Department in Washington, D.C. Susan Walsh/AP hide caption

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FBI Director nominee James Comey prepares to testify on Capitol Hill in Washington on Tuesday, before the Senate Judiciary Committee hearing on his nomination. Comey spent 15 years as a federal prosecutor before serving in the George W. Bush administration, where he is best-known for facing down the White House over a warrantless surveillance program. Evan Vucci/AP hide caption

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President Obama is expected to nominate James Comey, seen in 2004, to be the next director of the FBI. Mark Wilson/Getty Images hide caption

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Former Deputy Attorney General James B. Comey waits to testify before the Senate Judiciary Committee in Washington on May 15, 2007. NPR has learned that Comey is in line to become President Obama's choice as the next FBI director. Susan Walsh/AP hide caption

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Members of the FBI's Hostage Rescue Team during a training exercise in Quantico, Va. Two FBI agents who were part of the unit died Friday during a training exercise offshore near Virginia Beach, Va. FBI.gov hide caption

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The controversies facing his administration could be creating a stiff headwind for President Obama's second-term agenda. Jack Plunkett/AP hide caption

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FBI Special Agent in Charge Richard DesLauriers (at the microphones), Boston Police Commissioner Edward Davis (standing, at far left) and other authorities briefing the news media on April 19. That's the day Boston bombings suspect Tamerlan Tsarnaev was killed and his brother, Dzhokhar, was captured. Neal Hamberg /Reuters /Landov hide caption

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Cell phone communication can be hacked, tapped or otherwise tampered with. A new app aims to change that. iStockphoto hide caption

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