Constitutional law professor Jonathan Turley weighs in after Kevin O'Connor, the former White House doctor, pleaded the fifth during the House's investigation into the alleged cover-up of former President Biden's mental decline. #foxnews #biden #whitehouse #coverup #news #kevinoconnor #mentaldecline #bidencoverup #bidendecline #health #usa Subscribe to Fox News! https://bit.ly/2vBUvAS Watch more Fox News Video: http://video.foxnews.com Watch Fox News Channel Live: http://www.foxnewsgo.com/ FOX