Rep. Brandon Gill, R-Texas, on former President Biden's White House doctor pleading the fifth when questioned about Biden's mental fitness and New York City mayoral candidate Zohran Mamdani railing against 'White privilege' in a 2014 newspaper. #FoxNews #mamdani #newyork #nyc #mayor #biden #health #mentalwellness #fitness #whitehouse #doctor #takethefifth #usa #politics Subscribe to Fox News! https://bit.ly/2vBUvAS Watch more Fox News Video: http://video.foxnews.com Watch Fox News Channel Live: