(Editor's note: This story has been updated to include new reporting from a press briefing with Rep. Mac Thornberry (R-TX), ranking Republican on the House Armed Services Committee.) Rep. Mac Thornberry (TX), the top-ranking Republican on the House Armed Services Committee, said today he opposes any plan that would use Defense Department funds to construct a wall on the southern border, per an option that has been floated by President Trump. "I am opposed to using defense dollars for...