this man is lying. is that a big surprise that michael cohen is lying? the man is a complete pathological liar. whether it happened or didn't happen, it's not illegal. >> in his defense, michael cohen is not a perfect witness. how do you think this defense would hold up in court? >> if you're a prosecutor it's not the first time you'll use a flip defendant and give you testimony. i'll admit michael cohen has flaws. he has challenged the definition of what is telling the truth many times. i'm confident that robert mueller and the southern district of new york have corroborating evidence in the forms of audio tape, e-mails, text messages. those have been referenced in the sentencing memoranda. i know that mueller has something to basically back up what michael cohen has said. because of that, michael cohen may be one of a parade of witnesses, including david pecker, the ceo of ami, the parent company of national