Two Republican presidential candidates were also in Des Moines this weekend trying to garner support from Iowa Republicans.
Those two men, former U.S. Representative Joe Walsh and former Massachusetts Governor Bill Weld, were trying to convince the middle-of-the-road Republicans who aren't pleased with President Trump to not caucus for the incumbent.
"When you're my age, we may have three or four viable parties in this country," Walsh said.
Walsh and Weld made last-minute attempts to appeal to voters in downtown Des Moines. They’re here just days after President Trump held a rally in Des Moines, which saw more than 7,000 supporters.
"While we're proudly creating jobs and killing terrorists, congressional Democrats are consumed with partisan rage and obsessed with a deranged witch hunt hoax," Trump said during his visit to Des Moines.
Trump, according to the latest Gallup poll, is holding an 88 percent approval rating among Republicans.
That still didn't keep Walsh from taking a verbal swing at the president.
"I think Donald Trump is a horrible human being, Walsh said. “I think he lies every time he opens his mouth. I don't think he's capable of putting the country's interest in front of his own."
Weld, who’s catering to more moderate Republicans, is questioning the president's foreign policy, claiming the U.S. needs to engage more in global trade.
"I want to represent my part of the party, which is not isolationist and doesn't believe in trillion-dollar deficits and believes in engagement around the world," Weld said.
Can they beat President Trump? It's unlikely, but they say it's worth a shot.
"I still believe the things I believe in, but seeing Donald Trump in the White House, I've seen the light,” Walsh said. “We've got to bring people together."
Walsh also mentioned he would likely endorse a Democrat if President Trump secures the nomination.
Weld didn't answer that question directly, saying he didn't know yet.
It is somewhat unusual for an incumbent Republican president to run opposed. Reagan ran unopposed in 1984, as did George H.W. Bush in 1992 and George W. Bush in 2004.