 President Biden canceled an address in Las Vegas yesterday and returned to his home in Delaware. His aides say he tested positive for the coronavirus and has mild COVID symptoms. And Pierre's Deepa Shivaram has more. The White House says Biden is experiencing mild upper respiratory symptoms, including a runny nose and a cough. He felt OK, his doctor says, for the first event of the day that he attended. But since he didn't feel better, Biden later took a COVID test and the results were positive.