katherine harris asked about a series of issues, including the pandemic. >> reporter: is covid-19 the greatest threat to your re-election? >> i don't know. i've done a great job. now i have to do it again. i was sailing to a win, sailing. we were sailing right into a win. we had the greatest economy ever for our countr and the world. >> reporter: president trump accused his presumptive rival, former vice president joe biden of already damaging the country's recovery. >> the possibility that joe biden gets elected, that's a huge downward pull on the stock market. >> reporter: you say that's affecting the stock market right now? >> oh, absolutely. the stock market would be much higher, except for the fact that if he got in, the stock market will crash. >> reporter: the president criticized his challenger's choice of face coverings, after he wore a mask for the first time in public this past weekend at a military hospital. would you urge americans to wear masks right now? >> if it's...

>> there's a direct line from the administration against dr. fauci. peter navarro published a squaiting op ed. he writes, quote, dr. anthony fauci has a good bedside manner with the public, but he has been wrong about everything i have entrak interacted with him on. he lists several examples of what he claims dr. fauci has been incorrect about and says, quote, when you ask me whether i listen to dr. fauci's advice, my