WASHINGTON (AP) - Fed-up lawmakers on a House oversight committee said Tuesday they want to strip a federal nuclear agency of its security responsibilities and threatened to shut down Los Alamos National Laboratory to correct a decade of security lapses there. Rep. John Dingell, D-Mich., said he has sat through nearly a decade of hearings in which the Energy Department and the northern New Mexico nuclear weapons lab have promised to fix security problems. "I've been hearing these promises for a long time, and they've become somewhat tedious," he said. Lawmakers blistered the lab for its most recent security breach...