 NBC News Radio. I'm Chris Garagio. President Biden is showing improvement as he continues to recover from COVID. That's the word from the White House physician. As Biden remains in Delaware, where he is self-isolating, Dr. Kevin O'Connor says the president tested positive again today and has taken his sixth dose of Paxlovid to help with his symptoms. Those include a loose, nonproductive cough and hoarseness. The update comes as the Biden campaign is rejecting calls to drop out of the race. At least 36 congressional Democrats, including four senators, have called on Biden to step aside.