The former president's dominant position has turned Iowa's first-in-the-nation contest into a race for second place, as both Florida Governor Ron DeSantis and former U.N. Ambassador Nikki Haley are aiming for a clear runner-up finish to emerge as the chief alternative to Trump.
"This is showtime. This is what we've been waiting for," Haley told supporters at a diner in Des Moines.
A strong second-place showing for either Haley or DeSantis would keep alive the idea that Trump's march toward the nomination is not a foregone conclusion.
A commanding victory for Trump in Iowa would bolster his argument that he is the only candidate in the Republican field capable of taking on Democratic President Joe Biden in the November election.
It would also spell trouble for his challengers, especially DeSantis, who has wagered his campaign's viability on Monday's Iowa caucus, pouring resources into the Midwestern state and barnstorming all of its 99 counties.
A third-place finish could prove fatal to DeSantis' prospects. Polls show the Florida governor far behind Trump and Haley in the more moderate state of New Hampshire, where Republicans will choose their nominee eight days from now.
Both DeSantis and Haley have expressed confidence that they will exceed expectations in Iowa, though neither has predicted victory.
Ken Cuccinelli, who founded the Never Back Down committee that supports DeSantis, said months of organizing would help turnout. "We'll see how much the people of Iowa reward his work level, which is beyond any other candidate in the race," he said.
DANGEROUS WEATHER
Trump will spend the day doing radio interviews and meeting with staff, according to a person familiar with the matter. He is expected to visit one caucus site in the evening before heading to his watch party in Des Moines.
The life-threatening cold blanketing the Midwest forced the campaigns to cancel several events over the weekend and could dampen turnout on Monday.
Unlike a regular election, Iowa's caucuses require voters to gather in person on Monday evening in small groups at churches, schools and community centers, where they cast secret ballots after speeches from campaign representatives.
Iowa Republican Party Chair Jeff Kaufmann said on Sunday he thought those speeches would play an outsized role this time because candidates had to cancel so many events due to the weather.
Caucus meetings will start at 7 p.m. CST (0100 GMT on Tuesday) and results are expected a few hours after that.
Iowa Democrats will caucus across the state to conduct party business but vote for their nominee later by mail, with results released in March. Democrats reshuffled the party calendar last year, putting states with more diverse populations ahead of Iowa for picking the party leader.
Entertainment mogul Jeffrey Katzenberg, a co-chair of Biden's campaign, and Illinois Governor JB Pritzker will speak in Iowa later Monday.
The National Weather Service predicted the wind chill temperature could reach minus 45 degrees Fahrenheit (minus 43 degrees Celsius) in some parts of the state.
The 2016 Republican caucus saw record turnout, with about 187,000 votes cast, or approximately 29% of the state's registered Republican voters. Republican turnout was closer to 18% in 2012.
"The Trump people aren't going to be afraid of the weather," said Brad Boustead, a Republican official who attended a Trump rally in Indianola on Sunday.
Iowa has historically played an outsized role in presidential campaigns due to its early spot on the campaign calendar. Candidates often spend months fanning out across the state and introducing themselves to voters, and many campaigns have ended after a poor showing.
While the state swung heavily for Trump in 2016 and 2020, it backed Democrat Barack Obama in the previous two elections.
In 2008, 2012 and 2016 — the last three competitive races — the winner of Iowa's Republican caucuses did not go on to secure the nomination, in part because Iowa's large evangelical population means the state is more socially conservative than the country as a whole.
Trump has maintained an impressive lead in national polls despite facing four separate indictments, including state and federal prosecutions centered on his efforts to overturn his 2020 election loss to Biden, who will face the Republican nominee in November's general election.
Trump has continued to claim falsely that Biden's victory was the result of voter fraud.
