Congressional investigations into the Christmas Day bombing attempt on a U.S. jetliner have revealed that intelligence agencies sometimes allow suspected terrorists into the U.S. as a way to better monitor their activities. Undersecretary of State Patrick Kennedy told the House Homeland Security Committee that known extremists do not automatically have their visas revoked. "We do take one preliminary step," Kennedy said. "We ask our law enforcement and intelligence community partners, 'Do you have eyes on this person, and do you want us to let this person proceed under your surveillance so that you may potentially break a larger plot?'"

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