Critics of the U.S. National Security Agency's bulk collection of U.S. residents' telephone records should offer a better way to track terrorists and protect the country against attacks, the agency's director said Wednesday.
The NSA's bulk collection of U.S. telephone records is the "least intrusive" way to track suspected terrorists' communications with people in the U.S., General Keith Alexander said, defending the NSA's mass data collection and surveillance programs to the U.S. Senate Judiciary Committee.

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