The head of the country’s National Security Agency testified Wednesday that surveillance has stopped “dozens” of potential terrorist attacks by looking at the phone records, emails and other Internet searches of people suspected of terrorism-related incidents.

Army Gen. Keith Alexander told a Senate panel that securing a “cyber arena” could be done without infringing upon the privacy rights of Americans.

“We do not see a tradeoff between security and liberty,” Alexander said, later adding, “We are trying to protect Americans.”

Alexander did not go into detail about what terrorist attacks were thwarted or when.

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