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National Security Agency Director General Keith Alexander arrives to testify before the House Select Intelligence Committee on the NSA's PRISM program, which tracks web traffic and US citizens' phone records, during a hearing on Capitol Hill in Washington, DC, June 18, 2013. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
National Security Agency Director General Keith Alexander arrives to testify before the House Select Intelligence Committee on the NSA's PRISM program, which tracks web traffic and US citizens' phone records, during a hearing on Capitol Hill in Washington, DC, June 18, 2013. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

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Erin Burnett talks to Rep. Adam Schiff about the NSA report that surveillance thwarted more than 50 terrorist attacks.

Schiff: The NSA needs to declassify more

Erin Burnett talks to Rep. Adam Schiff about the NSA report that surveillance thwarted more than 50 terrorist attacks.