With a little over two weeks until the U.S. election, Trump reiterated a claim that the reason for a high number of cases was because "we have the greatest testing in the world".
"Now if we did half the testing we would have half the cases. If we cut that in half we would have another half cut," he said.
The United States set a single-day record of more than 84,000 new COVID-19 cases on Friday (October 23), according to a Reuters tally, with the spike in infections hitting election swing states including Wisconsin.
Trump also criticized his election rival Joe Biden for talking about a "dark winter", saying that he is an "optimist".