 The White House says President Biden has tested positive for COVID again. He was tested while visiting Las Vegas yesterday and is self-isolating after experiencing mild symptoms. The illness comes at a crucial point for the 81-year-old Biden, who has been losing ground in battleground states against Donald Trump. As he boarded Air Force One to depart Las Vegas to recuperate in Delaware, Biden climbed the stairs slowly yesterday, holding the railing tightly and pausing a couple of times. Marsha Espinoza is a former Homeland Security official in the Biden administration.