Afraid? Cowards. Not a single valid reason they should not debate ( if Trump tests negative).
How would we know since the WH refuses to say when he was tested or release the results of his tests. No doubt because they show he is positive and infectious.
As for cowards, it's Trump who is refusing to debate, not Biden! And it's the Debate Commission who made the decision to go with a virtual debate, not Biden. And they did so to follow the WH's own directives on the virus.
Try to keep up, Napa!