. >> more on this from our military analyst stephen ganyard and our new senior attorney correspondent ian pannell. you spent many years in syria and know the assad regime well. we don't know the intelligence behind this warning from the white house but do know assad has done it before. >> we do know he's done it dozens of times before according to many analysts. assad has defied conventional logic. applying the kind of analysis saying why would he do it because president trump has struck before and the because of the psychological impacts they have and secondly because he can. there's only been one response in the past and that was that air base was back in action within hours. >> the big question, obviously a statement like that designed to deter assad. will it work? >> that's a very good question. i mean, if people believe that president trump will respond again and will have to ratchet up that response, then you've got to conclude that assad will have to pause, will have to think about whether he will go through with that threat. >> let's talk about the possible response now from s

joining us is abc news consultant colonel stephen ganyard. if baghdadi is, indeed, dead, what does this mean for the fight against isis. >> robin, probably in the short term it will have some effect in the fight around raqqah. it may upset the isis leadership. so but longer term think about what happened after bin laden, not much. this is an ideological struggle. not like north korea where if kim jong-un was killed the regime would collapse. in an ideological structure like this killing an individual soldier may not have a long-term effect. >> as david just mentioned this is not the first time that he has been reported dead. so how do we know for sure? >> well, we don't. remember, raqqah is a city under siege so the russians have no hard evidence. there's no dna evidence that would suggest that he's dead. the other thing is this morning, robin, the department of defense and the u.s. has told us that they've heard no chatter. so nothing to back it up. no intelligence to back it up. we need to remain suspect in the claim. >> i'm sure. thanks so

. >>> joining us is abc news consultant colonel stephen ganyard and, steve, should travel be banned altogetherst travel there to north korea? >> robin, it's not a matter of if, it's if they could so remember these tour groups are run out of china so even a congressional act is going to have very limited way to deter any american that wants to go there. if you think back in the day when people wanted to go to cuba they always found a way so i think if people really want to go to north korea no law will stop them. >> what do you make of the arguments the tour company should be held responsible in some kind of way? >> well, part of this is caveat emptor, the buyer beware. you need to think about where you're going and w you saw gio put up that site, very slick site that makes it look like some sort of third world disney world. it's not, a dangerous place. >> do you have suggestions on if you are going to travel there how you can try and stay safe? >> ironically, robin, traveling in north korea is actually quite safe. they want tourists to come in. they need the hard currency so otto warmbier was