came camera, a trump campaign official who oversaw all digital advertising is going on record on cnn to say it simply didn t happen. trump followers had amazing engagement. reporter: gary, the director of advertising for the republican national committee and trump for president campaign told cnn by phone, we d never put money behind someone else s facebook page or source and added, we did not back anyone s hillary s stories, had nothing to do with fake hillary stories or any hillary stories not our own. we produced content. reporter: brad, a lead contractor on trump s digital campaign, has also denied involvement with russia. he s been called to testify before the house intelligence committee to square to that under oath. facebook has done its own internal review and reported it did find malicious actors spreading misinformation, but said in a statement to c northbound, we ve been in touch with a number of government