WASHINGTON (AP) - Bush administration plans to deploy thousands of National Guard troops to shore up the U.S.-Mexico border were getting mixed reviews Tuesday, with members of Congress questioning whether it would strain a force stretched thin by wars and natural disasters.

Pentagon officials tried to tamp down those concerns, insisting that the decision to use up to 6,000 Guard members to help secure the porous 2,000-mile border will not overtax the guard or impair troops