The head of the National Security Agency expressed deep concerns about terrorists' ability to avoid NSA surveillance, explaining that Edward Snowden's revelations of surveillance techniques and capabilities have had a "material impact" on NSA ability to prevent and detect terror plots.
The head of the National Security Agency expressed deep concerns about terrorists' ability to avoid NSA surveillance, explaining that Edward Snowden's revelations of surveillance techniques and capabilities have had a "material impact" on NSA ability to prevent and detect terror plots.
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