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U.s. security, both short-term, medium-term and long-term, would be the possibility of a terrorist organization obtaining a nuclear weapon. this could change the security landscape for years to come. >> reporter: we did hear from secretary of state hillary clinton and robert gates. they both say that intelligence shows that this is a real serious threat, that world leaders have to deal with. so the bottom line in the summit is to try to get the world leaders together to sign on to a document and a communokay, if you will, saying, look, we are going to go ahead and fry to secure these loose nuk...

Could get their hands on nuclear materials like al qaeda, like criminal gangs and put together a nuclear weapon and attack the united states or other countries. this is something that is an imminent threat and must be dealt with. this is how the president put it yesterday in kicking off the summit. >> the single biggest threat to u.s. security, both short-term, medium-term, and long-term, would be the possibility of a terrorist organization obtaining a nuclear weapon. this is something that could change the security landscape in this country and around the world for years to come. if there was...

The threat. >> the central focus of this nuclear site is the fact that the single biggest threat, both short-term, medium, and long-term, is the terrorism organization obtaining a nuclear weapon. this is something that could change the security landscape in this country, around the world for years to come. >> so, don, the goal of the summit here is for all of the countries to get on board with president obama's plan to secure these nuclear materials, or loose nukes, within four years. this is around the globe. so we are expecting these world leaders to sign in the next few days a document, ess...

Countries that had nuclear weapons that were the major threat. it's rather the idea, the potential that terrorists, al qaeda, criminal gangs could get their hands on nuclear materials, loose nukes, and create havoc throughout the world. this is what president obama said when he was with the south african leader. south africa, of course, giving up its own nuclear program. here is how he put the threat. >> the central focus of this nuclear summit is the fact that the single biggest threat to u.s. security, both short term, medium term, and long term, would be the possibility of a terrorist organ...

Of libya. cnn's barbara starr is at the pentagon. barbara, what do u.s. officials believe russia is trying to accomplish here? do they foresee russia military operations inside libya? >> reporter: the pentagon and u.s. intelligence community urgently trying to figure out why there may be russian special forces about to go into libya. the trump administration firmly keeping the door open to cooperating with vladimir putin to fight isis in syria. >> president has been very clear in the past that the country shares our commitment to defeating isis and we can work with them in an area of shared mu...