Biden said the Oct. 15 debate in Miami should only be staged under strict health guidelines and called the coronavirus outbreak that has hit Trump and a wave of other White House officials "a very serious problem."
"If he still has COVID, we shouldn't have a debate," Biden told reporters after a campaign stop in Pennsylvania.
"I'm not sure what President Trump is all about now. I don't know what his status is. I'm looking forward to being able to debate him, but I just hope all the protocols are followed," Biden said.
After days of conflicting messages from doctors and aides about his condition, Trump, 74, returned to the White House on Monday (October 5) after three nights at a hospital. His doctor said on Tuesday that Trump reported no COVID-19 symptoms and was doing "extremely well."
The normal quarantine period for anyone testing positive for the novel coronavirus is 14 days. Trump announced his positive test on Friday.