2016 october surprise came in the form of a letter to congress, from the then director of the fbi, james comby. to campaign adviser. new fbi who's husband was under investigation for online sex crimes. the announcement was made just 11 days before the election. and one reason it was so powerful is because trump had made such a big deal out of the hillary clinton e-mails so it fit in to his, one of had his main messages against her. >> that is absolutely right. it absolutely fit in to the republican critique and attack on hillary clinton, but the other part of it too, is that it came from a credible place. cbyd notheteo you believe hy?>> do, andoree s believe it and what they say is, it's the single most measurable impact on the outcome. >> last night, i congratulated donald trump and offered to work with him on behalf of our country. >> barrett admits that we can never know with absolute certainty that it did change the election result, but we know that another 2016 october surprise did not. >> and when you -- you can do anything. >> whatever you want. >> grab them by the -- you can do anythin