politicized. perhaps the things they are saying so publicly might backfire and politicize even more. joan, thank you so much. >> sure. we have major breaking medical news that could be a game changer in the fight against coronavirus. this is one of the holy grails that people have been waiting for, an anti-viral, a pill that could keep you from getting sicker once you get covid. drug maker merck has an experimental pill that cuts the risk of hospitalization and death in half. now, this is according to merck so far. this is clinical trials. merck has put out information that says it plans to apply for emergency use authorization as soon as possible. again, we're just seeing this information now. and if it is what it purports to be, this could be hugely important. dr. sanjay gupta will join us