The National Security Agency's collection of U.S. Internet and cellphone data has foiled "dozens of terrorist events," says NSA chief Keith Alexander, appearing this week at the Senate Appropriations Committee to speak about the recently revealed domestic spy programs. But Sen. Patrick Leahy, D-Vt., said the NSA's secrecy about the programs has not inspired confidence. "The intelligence community has told us that we obviously don't have the ability as simple senators to know anything as well as you do," Leahy said.

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