the u.s. has said that it's going to make sure all iranian troops are going to leave syria and is willing to stay the course. are we headed towards a confrontation with iran? >> well, iran has been confronting the world as the world's largest state sponsor of terror for quite some time. >> seems there is an escalation, though. >> they have armed militias, the hezbollah and militias in iraq, they are arming the houthis, launching missiles into the gulf states. the united states has begun to apply economic and diplomatic pessure on iran to prevent them from doing this. that's our mission. it is true, elise, we have told the islamic republic of iran that using a proxy force will not prevent us from responding against the prime actor. we will not let iran get away with using a proxy force to attack an american interest, iran will be held accountable for those incidents. >> even militarily? >> they're going to be held accountable. if they are responsible for the arming and training of into he is militias, we're going to go