May 15 (UPI) -- Pentagon lawyers are reviewing a request by the Department of Homeland Security for the Defense Department to activate 20,000 National Guard troops to enforce immigration laws as part of the Trump administration's effort to rein in illegal migration. The story was first reported by The New York Times on Thursday. "Defending the homeland and protecting U.S. territorial integrity is a fundamental DoD mission," a Defense Department spokesman told ABC News . "The Department will