GOP candidates make last-minute appeals to Iowan voters a day before caucuses. Follow live updates

With just one day to go until Iowa's presidential caucuses, the candidates are urging their supporters to brave bone-chilling cold and blustery wind to help carry them through Republicans' leadoff voting contest.

The final Des Moines Register/NBC News poll before Monday night's caucuses found former President Donald Trump maintaining a formidable lead, supported by nearly half of likely caucusgoers. Nikki Haley, the former U.N. ambassador and South Carolina governor, and Ron DeSantis, the Florida governor, remain locked in a close battle for second.

Trump, Haley and DeSantis are fanning out across Iowa on Sunday to meet with voters. Already, Haley was forced to cancel an in-person stop because of poor weather conditions.