we'll watch carefully next steps. as a new leader and leaders pop up, we'll go after them as well. >> as you noted, the physical caliphate has largely disappeared as the u.s. and the kurds have beaten it back, but obviously there's still thousands if not tens of thousands of isis terrorists that remain. what is the status of isis right now? >> as we've been saying for some time now, we want to ensure the enduring defeat. that means we have to continually monitor the situation. as we see groups pop up or coalesce, or establish a training camp, we go in and take them out so they're no longer a threat to the united states, our allies or partners. >> the president has said they're defeated. they're not fully defeated. >> it's a physical caliphate. it's hard to defeat an ideology. we're going to have to stay on top of this and make sure we have the capability to go in and destroy targets as they arise. >> when are all u.s. troops going to leave syria as president trump has said he wants to do, but obviously a lot of military officials have said