"I'm the only one on this stage who has personally prosecuted everything from child sexual assault to homicide."
Two more US presidential debates are scheduled before the US election, but they are now up in the air with Trump's diagnosis.
Joe Biden, 77, has said he would not want to debate if the 74-year-old Trump is still sick with the virus.
But Trump, ever the hyperbolic showman, said in a Wednesday video that he felt "perfect" and called his infection "a blessing from God".
Trump appeared to be watching the vice presidential debate avidly, tweeting without using Harris' name that "she is a gaffe machine".
(Writers: Eric Baradat, Shaun Tandon, Michael Mathes)
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