Fox News host Lara Trump joins ‘Fox & Friends Weekend’ to discuss new testimony from an ex-Biden aide in the probe into the former president’s mental fitness. #foxnews #news #laratrump #biden #politics #mentalfitness #foxandfriends #breakingnews #uspolitics #exposed #liedto #trump #age #pollingproblem #foxnewsalert 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/ Download the Fox News app: