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Seen gives me great confidence in their assessment that the russians carried out this hack. the hack of the dnc. and the hack of the john podesta. not much happens in russia without vladmir putin. >> reporter: the cia and fbi agree as to why. director john brennan telling the cia work force that quote, there is strong consensus among us on the scope nature and intent of russian interference in our presidential election. u.s. intelligence and law enforcement assess that moscow had multiple possible motives. undermine confidence in the vote. weaken hillary clinton. and help donald trump. the pre...

There were going to be serious consequences if he didn't. >> reporter: u.s. officials say that russia's hacking of u.s. political organizations continues unabated. since the election, one attempted breach targeted the clinton campaign, though unsuccessfully. president elect trump continues to dismiss the u.s. assessment that russia is responsible. >> we had a meeting -- >> reporter: despite the fact he's being provided the intelligence behind that assessment in his classified briefings. he sought to divert attention back to one of the revelations gleaned from the e-mails stolen by russia. twee...

Against russia over their alleged hacking and interference in this election, and this as a strong consensus within the intelligence community builds over russia's full intent of the hack. cnn's chief national security correspondent jim sciutto walks us through that. >> reporter: victor and christi, the cia director seeking to dismiss accusations from some gop lawmakers, even the protect himse -- president-elect himself, that the gop is politicizing the russian hacking, writing to the entire cia workforce that the intelligence community and law enforcement are in full agreement on the seriousne...

Pulling off something as audacious as swinging a u.s. election. >> right. president obama has pledged a spanse -- response to the hacking. president elect trump has been less than emphatic about a response. could this damage the relationship they might have with donald trump, especially if president obama moves forward with retaliation? >> reporter: well, i think it depends on the kind of retaliation that we might see from president obama. keep in mind, he has a very finite period of time to achieve whatever his objective might be. there are several options available to him. he might try to go...

Attacks on the side livlines of g-20 meeting in china, saying "cut it out or face serious consequences." also breaking tonight, the cia director is moving to dispel suggestions that there's disagreement between the cia and fbi, saying they're all on the same page when it comes to russian hacking. we're covering all of that much more this hour with our guest, including former senior adviser to the trump campaign and former congressman jack kingston and the president of the naacp cornell william brooks. our expert analysts and correspondents are also standing by. let's begin with jim sciutto. ji...