hillary clinton, or sow seeds of doubt about the american electoral system. all that remains a motive or a matter of debate. regardless of a motive the intelligence committee is now saying they're confident moscow did meddle in the u.s. elections. how do top security and intelligence analysts come to that conclusion? how do they conduct a cyber autopsy? before the election when russian hackers were first suspected of interfering with the u.s. elections, candidate donald trump was not convinced. >> i mean, it could be russia. also could be somebody sitting on their weigh that weighs 400 pounds, okay? >> now that the u.s. intelligence community says it's confident russian hackers are likely behind the cyber security breaches, with some debate within the community over whether the hackers were trying to help trump, the president-elect is weighing in again. quote, unless you catch hackers in the act, he tweeted monday, it's very hard to determine who is doing the hacking. well, one thing about that.