The president also called Democratic lawmakers "far more unreasonable" than China or North Korea.
"The toughest nation to deal with are the Democrats in the USA," Trump said. "The Democrats in the USA are much tougher to deal with than any of these people that we deal with. They're far more unreasonable, and actually, they're a little crazy."
Throughout his presidency, Trump has had a beleaguered relationship with Democrats, with the president often referring to left-leaning media as "fake news."
Trump has made other controversial statements in recent days.
During his Saturday kickoff campaign rally in Tulsa, Oklahoma, Trump said that he told officials in his administration to slow down COVID-19 testing.
"You know testing is a double-edged sword … Here's the bad part ... when you do testing to that extent, you're going to find more people; you're going to find more cases. So I said to my people, slow the testing down please,” Trump said.
Trump also used an offensive term to refer to COVID-19 during his rally, calling the respiratory illness the “kung flu,” which is a reference to the Chinese martial art of kung fu.
"It’s a disease, without question, has more names than any disease in history,” Trump said during his rally speech. “I can name – kung flu. I can name 19 different versions of names. Many call it a virus, which it is. Many call it a flu. What difference. I think we have 19 or 20 versions of the name,” he continued.
During the rally, Trump once again shut down the idea of renaming military bases honoring Confederate generals in the wake of protests across the nation against racial injustice.
“The unhinged left-wing mob is trying to vandalize our history, desecrate our monuments, our beautiful monuments. They want to demolish our heritage so they can impose their new, repressive regime in its place,” Trump claimed.
According to national polls, 2020 Democratic presidential candidate and former US Vice President Joe Biden is currently ahead of Trump by around nine points.