 A new health challenge for President Biden amid the calls for him to step aside in the 2024 race. Here's CBS's Nicole Killian. President Biden arrived back in Delaware late last night, abruptly cutting a campaign trip short in Battleground, Nevada, after testing positive for COVID. The president took his time coming down the stairs of the plane, pausing to look around and holding onto the railing. He then slowly made his way into the car, appearing to struggle as he climbed in.