Transcript for Trump orders withdrawal of US troops from Syria

President trump is claiming victory in Syria over a crisis. And is expected to announce that all US troops will be withdrawn in the next thirty days right now 2000 American service members in Syria. Are providing assistance and security in the fight against crisis which still controls pockets and Syria and Iraq president from Tweeter Wednesday morning we have defeated prices and Syria. My only reason for being there. The White House released a statement saying US troops have started returning home. At the transition to the next phase of the campaign but the Pentagon followed with a similar statement making it clear quote the coalition has liberated the isotope territory. But the campaign against crisis is not over according to comments come a week after a very different message from the state and defense departments. Nobody is declaring mission accomplished defeating a physical talent fate is one phase of a much longer. Term campaign bipartisan reaction on Capitol Hill swept I don't know who advised that this decision we made. But it's a terrible mistake was this decision made. With the advice of the military. Counter to the price of military. That's the first question that I won and who have been at war for too long. I commend the president for its decision the most vocal critic trump ally GOP senator Lindsey Graham that day we withdraw from Syria puts in motion. I think a lot of bad things in the region and will eventually pay for it here. Just as we did in Iraq. We're gonna the president made the decision yesterday days after speaking we're Turkey's president about the withdrawal. Many lawmakers on both sides are concerned the US will lose influence in the region leaving Syria in the hands of its dictator Russia and Iran. Kenneth Bolton ABC news Washington.

This transcript has been automatically generated and may not be 100% accurate.