Officials, it is highly likely that a bomb plant by isis or one of its affiliates destroyed that russian jet over the Sinai Peninsula. Intelligence suggests the bombers may have received assistance from inside the airport, but russian and egyptian officials reject those theories. They say theyre speculative, premature, they urge caution. They say theres no evidence to support any conclusions. Britain is taking no chances, though. It has suspended all flights in and out of Sharm El Sheikh airport where, of course, the doomed flight originated. Right now egypts president is in london for meetings with the british Prime Minister. Lets get over to Senior International correspondent Clarissa Ward is in london. Shes watching this meeting as this meeting has been taking place. What has been coming out of it . Reporter well, kate, the egyptian president , Abdel Fatteh El Sisi sat down with the british Prime Minister for two hours. In a statement afterwards he said the egyptians would do anything they can to cooperate with british authorities and British Security officials on the ground in Sharm El Sheikh who are essentially trying to comb through the security processes that are going on in that airport and to improve them to get to a point where those flights can resume back and forth, to and from Sharm El Sheikh. Now earlier in the day the before theish Prime MinisterDavid Cameron met with his cabinet. He held an emergency meeting and afterwards he made a statement saying, while its not certain that it was a bomb that brought down this passenger jet, it was, quote, more likely than not. So still couching his language. He also wouldnt be drawn on the issue of whether or not isis is responsible for this attack. If, indeed, this was an attack, he also said that he had a conversation with president putin of russia to try to explain some of the intelligence that has led the British Government to take this fairly drastic measure. Now the focus here in the uk, kate, is on really trying to get some of those roughly 20,000 british citizens who are stranded in Sharm El Sheikh, back to the united kingdom. That effort is expected to be under way tomorrow. Were hearing egyptian leader saying british have been asking us to look at our airports for ten months, which is natural. Whats not natural is shutting down flights to this region. Something the british would not be doing, something these independent airlines would not be doing unless they had real reason to worry. So far at least, from where youre standing, egypt and the egyptian leader havent been offering real explanation. Reporter no, he hasnt really offered any explanation. We know the egyptians feel that the u. S. And the uk have been too quick to come out with this warning. What the Prime Minister here said, we cant take any risks when it comes to the lives of british citizens. Well take any preemptive actions we think are necessary. Obviously, this is a sticky issue. Tourism is a huge source of revenue for the egyptian government. President sisi was here on what was supposed to be a threeday state visit where they would discuss trade and security, and that has been marred by this issue, which obviously is now topping the agenda. Clarissa ward for us outside 10 downing street in london. Where british leaders have been meeting with the egyptian leaders. So much to discuss there. And not broad agreement at this point. Lights bring in paul and cnns intelligence and security analyst, bob bair. Its great to see you both. Paul, i know youve been looking into this. The significance, essentially, if this is an isis affiliate putting a bomb on a plane, the significance of it cant be missed. The most significant terrorist attack since 9 11, second deadliest since 9 11. But this would turbo charge isiss popularity in the global jihadi movement, increase their standing. Theres so much anger right now in the sunni muslim world against the russians. Its also targeting an aircraft, so its a spectacular attack, which will hurt the egyptian economy, lead to more unemployment, lead to more fertile environment for terrorists recruitment. All sorts of reasons why this is a significant event. And may lead to geopolitical reverberations. Russia may play a bigger role in the syria intervention, may pivot towards striking isis. That could play into isiss hands. You can see even more foreign fighters going to syria. So, bob, the United States and britain say it was likely an isis bomb attack. Thats where theyre leaning right now. Egypt and russia say, no, not so fast. We dont buy it. Is this a case of not believing that it was a bomb attack or not wanting to admit it . They dont want to admit it moscow nor cairo have good credibility, especially on terrorism. They are both in denying. Putin is personally tied to this policy in syria. Claiming he can suppress this movement. The Islamic Movement in syria. This is a huge setback for putin. Its something he doesnt want to readily admit. Hed like to put some time between a finding on this airplane so i would definitely go with cameron in london, their assessment. Lets not forget, were not seeing the intelligence. Theres a lot of chatter, probably chatter before the attack as well as after. You look at the context, shrapnel wounds to some of the passengers, you look at the flash right before the plane went down and the rest of it. I think camerons probably got good reason to suspect this was a bomb that brought that airplane down. So, paul, if isis is planting bombs on planes, in Sharm El Sheikh, can they plant bombs on other planes . The capability may be an insider at the airport. If you have an insider at the airplane, you dont have to put the bomb through Airport Security scanners. It doesnt sister to be you can put it directly on the plane. All that expensive technology, not much point if someones working at the airport, can smuggle a bomb on a plane. The worry is theyll have other recruits in other airports elsewhere in the middle east. The worry also is that potentially this mole hasnt been arrested yet. I think that may be one reason theyre being so coy in all their statements, not giving detail saying its up to investigators. Were not going to tell you. Isis themselves. To protect someone working at the airport for them. Talk to me about the Sinai Peninsula. Whats going on there . Is this a hot bed of activity. We know syria, libya, is sinai now the latest hot spot . It is. The Islamic State calls it the sinai province, claims loyalty to Islamic State. A lot of groups there. Its an ongoing battle between the Egyptian Army and fundamentalists. Places like Sharm El Sheikh, youll see a lot of sympathy for the Islamic State. As paul was saying, even in the airport, airport workers. This is a real war going on in egypt and thats the reason there are all these cautions from washington and london. Dont go there. Dont fly over there. And now dont even fly out of there because this battle is very much ongoing. And right now the egyptians may be winning, the egyptian military, but were going to wait to see how this all gls with, whether they can suppress this movement or not. You touched on it earlier, paul, but how does russia respond . If isis have been able to plant a bomb on this russian jet, passengers were russian, what is the impact . If russia comes to the conclusion that isis was, indeed, in some way behind this, all bets may be off in terms of their response, both in syria and iraq potentially against isis but also in the Sinai Peninsula itself. Its not impossible that russia itself could launch air strikes against the isis affiliate in the sinai affiliate. You think that plays into isiss hands. It may because there will be more anger about russians targeting muslims on the ground, potentially, Collateral Damage to civilians being killed. As bob was saying, this is a very powerful insurgency. This group is believed to have more than 500 fighters over the last couple years. They killed more than 700 Egyptian Security forces. They killed an american, an oil worker in 2014. They beheaded a croatian, who was in cairo, who was adopted just recently. This is a very powerful isis affiliate in sinai. Is this a new capability or just a new logistical capability . I have a theory on this. A lot of these sophisticated airplane bombs are technology is old. It goes back to the 70s, but the technology was being held by damascus in baghdad with the breakup of those two states. A lot of this technology, presumably, has gone to people like the Islamic State. Now, we obviously dont know, as paul was saying, whether someone put this on or came through the luggage check or not. But this technology is out there and in the last couple of days, ive been asking people, the experts on this, and they keep on saying, this stuff can get through European Security checks, these sophisticated bombs, and american. And i said, what percentage . They said, 65 . I said this on tv the other day and i got a text from a senior official in the administration saying, right on. And so i think thats the estimate in washington as well. Thats unsettling. Thats reason for concern right there. Great to see you guys. Thanks so much. Coming up for us, donald trump for the first time launching ads in iowa and New Hampshire. What hes promising and who hes attacking now. Thats up next. Father versus son, president versus president. The elder george bush like you have never heard him before. 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And im going to bring jobs and money back to the United States. Ill take care of our veterans and make our military so strong that nobody will mess with us. Ill secure our borders and, yes, we will have a wall. If the people of iowa vote for me, youll never be disappointed. I dont disappoint people. I produce. There you go. Trump in New Hampshire is also hitting marco rubio over rubios personal finances. His use of a gop party credit card back in florida. But rubio, hes not taking it. Hes hitting back as well. Cnn chief Political Correspondent dana bash is there, has been talking to him. Dana, you almost had two different responses from marco rubio in the two days youve spoken to him. Reporter i did. I found it very interesting and perhaps telling about the impact that Donald Trumps pounding on marco rubio now for the past 24, 48 hours and his credit card use or charge card use, as marco rubio would put it. Last night when i asked him about it, he kind of blew it off. Today he went after trump. Watch the difference. Thats donald being donald. Whenever theres a bad poll he gets weird and does these sorts of things. He doesnt know what hes talking about. I find it ironic the only person rubbing for president thats declared bankruptcy four times in the last 25 years is attacking anyone on finances. Reporter but both times senator rubio did go on to explain whats at issue here, which is the fact that he had a party credit card, charge card, back in florida when he was in the state house, which he did use for personal expenses. And he explains it was not a bad thing because he paid it his personal expenses straight to the credit card company. You know what, this is playing into a narrative trump and other opponents have been trying to hit rubio on which is whether its this or the fact that he was part of a foreclosure on a house he had in tallahassee or the fact that he doesnt have a lot of money personally and had personal debt, all wrapped into a narrative that shows hes not ready to handle the economy and finances of this country. So, thats the reason why hes pushing back pretty hard on this. Hes getting pushed pretty hard on it and will, i think, in the coming days. Dana bash in concord, New Hampshire. Want to bring former Communications Director for senator ted cruz, who is a republican, in case you didnt know. I missed the memo on purple. What the its purple day dana, too. Those have been asking for months, why isnt donald trump advertising . When will he put a little money into this campaign . Well, were getting the first taste of it today. He has a couple radio spots. People know are cheaper than division. Its 300,000 buy as opposed to putting 10 million in tv ads in a few states. Still, whats the significance of him going on the air . I think this is a smart move by donald trump. Jeb bush has been pouring 10 million into tv ads and his poll numbers are going down, not up. Talk radio is a powerful medium for conservatives, particularly republican primary voters. And i think donald trump is putting money there, ted cruz is also putting money into radio before tv. I think thats where the smart money is and it moves the needle for gop voters. This ad is full of buzz words. Repeal and replace obamacare. We have no idea what his position is. Beef up the military. Im all for that. If this is an invitation for donald trump to talk about the issues and his plans, i think thats a good thing. But to this point, his supporters havent needed much more detail than those buzz words. They accept the trust me tag line. To danas reporting, trump is hitting rubio over the past 24, 48 hours on his personal finances, his use of this gop credit card. Rubio says it is much ado about nothing. But have asked this about Hillary Clinton and her emails. Do you think this issue for rubio, like hillary and her emails, will resonate with voters . Is this something thats going to stick with folks . I think rubios issue goes to his broader problem. It sort of fits into this, is he experienced enough to manage the presidency, manage the economy. Its a smart way to go after him. He has never been very clear on why hes had so many personal financial problems. Its not just about sort of the scandal and the improper use of the credit cards. Its, you know, his personal bankruptcy and things like that. Hes right to hit donald trump back, but eventually hes going to have to answer this stuff for himself. And i think rubios got to get a ahead of this. What do you think about his answer, some of his personal finance issues. Hes like, im not a rich guy. Thats his answer. People can relate to that. People struggle with money. Particularly when hes answering donald trump. He never got a Million Dollar loan from his dad. One point thats important to raise when we talk about these Financial Issues there was a state ethics investigation into it and they cleared him. They said there was some negligence, but he has been cleared. This came from charlie crist. He won a tough race in florida by it didnt stick to him. So, i dont think theyre too worried about it. I like his response. Like donald trump is down in the polls, hes going to come at me. But you think his team has done pretty good gr