Replacement cause?
That was my thinking. However, isn't Joe vaccinated? If Joe comes down with COVID and is fully vaccinated then he should only contract mild symptoms and recover in a reasonable amount of time. If NOT, then the WH and CDC have some explaining to do.
On the other hand, the WH will feed the American public any b.s. that they need to.
With people in the DEM party so disgruntled with Joe, I foresee him stepping down soon. It will be Kamel and Michelle or maybe Rice or Jarrett.