congress. the president's son don jr. appearing on fox news to drive home the point ahead of cohen's testimony. >> you got a president trying to deal with a major world issue and to try to distract or whatever it is by bringing in a convicted felon and known liar? i mean it is pretty pathetic. >> andrew mccabe does not see it that way. he tells cnn the perspective of the president's former fixer could be critical. >> i think mr. cohen has been in a position to have heard conversations and seen actions taken and maybe be able to provide that sort of insider's view on what the intent of the folks at the center of this investigation truly was. >> republicans sure to take don jr.'s lead and hammer cohen on credibility. here's what he said back in december. >> the man doesn't tell the truth.