President Barack Obama talks about National Security Agency surveillance Jan. 17 at the Justice Department in Washington. Seeking to calm a furor over U.S. surveillance, the president called for ending the government's control of phone data from hundreds of millions of Americans and immediately ordered intelligence agencies to get a secretive court's permission before accessing the records. Carolyn Kaster/AP hide caption

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People wait in line outside the Supreme Court in Feb. 2013 to listen to oral arguments in the Shelby County, Ala., v. Holder voting rights case. Evan Vucci/AP hide caption

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Attorney General Eric Holder speaks at a press conference at the U.S. Courthouse in Philadelphia on November 5, 2013 Matt Rourke/ASSOCIATED PRESS hide caption

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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 J. Edgar Hoover is seen in his Washington office, May 20, 1963. The 1971 burglary of one of the bureau's offices revealed the agency's domestic surveillance program. William J. Smith /AP hide caption

itoggle caption William J. Smith /AP