Watch: Dr. Fauci, Sen. Rand Paul Clash During Congressional Hearing

Sen. Rand Paul, R-Ky., clashed with Dr. Anthony Fauci over claims about funding the National Institutes of Health gain of function research at a Wuhan lab during a Senate hearing on the Covid-19 pandemic. Dr. Fauci refuted claims made and told the senator “you do not know what you are talking about.“ » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: Breaking News Alerts: