Hawkish GOP senators, whom Trump will need to keep him in office if the House moves ahead with impeachment, condemned the president's decision as a win for terrorists and a defeat for American credibility. “A precipitous withdrawal of U.S. forces from Syria would only benefit Russia, Iran and the Assad regime,” Senate Majority Leader Mitch McConnell said in a statement. Foreign policy has long been the issue where Republicans are most likely to disagree with Trump, and it's not clear that strong words against the president's Syria policy will cost him any political support.