and all around the world. i'm cyril vanier. >> we had fun. i'm natalie allen, and this is "cnn newsroom." thanks again for joining us. our top story if isis returns, so will the united states. that is the word from president trump about the future of syria. >> in an interview with cbs on sunday the president says he knows a troop withdrawal would cause a power vacuum, but says the military is ready for it. >> you could in that vacuum see a resurgence of isis. >> we'll come back if we have to. we can come back very quickly and i'm not leaving -- >> all of this comes ahead of tuesday's "state of the union" address which will likely include mr. trump's plans for the southern u.s. border.