All the major candidates for the Republican presidential nomination are campaigning in Iowa as they appeal to supporters to turn out for the caucuses despite the frigid weather.

Donald Trump implored his supporters Sunday to brave frigid temperatures and deliver him a decisive victory in Monday’s Iowa caucuses, saying their vote would help bring to Washington the retribution he has repeatedly promised if he returns to the White House.

The former president has set sky-high expectations for his own performance in the first contest of the race for the Republican presidential nomination. He spent the day before the caucuses trying to ensure he meets them. His main GOP rivals all spent Sunday in Iowa as well, making last-minute appeals to Iowans open to hearing them.

At a rally in Indianola, Trump said his supporters could fight back against his political enemies, claiming that the four indictments he faces were driven by politics and renewing his false claims about the 2020 election he lost to Democrat Joe Biden.