A recent study from Stanford University said more than a dozen of President Trump's rallies have led to thousands of new COVID-19 cases.
Researchers looked at rallies held between late June and September.
The study found that 18 of the president's campaign rallies have led to more than 30,000 COVID-19 cases and potentially more than 700 deaths.
Meanwhile, President Trump suggested he might fire Dr. Anthony Fauci.
"Don't tell anybody," the president said. "But let me wait until a little bit after the election."
President Trump has expressed his frustration over the coronavirus as he tries to reopen parts of the country.
Dr. Fauci has spoken publicly about the dangers of reopening quickly and how the president has ignored his advice.