Monday night's caucuses in Iowa mark the kick-off of the Republican nominating process, with voters participating after extensive campaigning. Key figures include former President Donald Trump, Florida Gov. Ron DeSantis, former U.N. ambassador Nikki Haley and entrepreneur Vivek Ramaswamy, all engaging in last-minute appeals before the 7 p.m. Central time at which the caucus will convene.

Iowa Caucus Mechanics Explained: The caucus process, as Maegan Vazquez from the Washington Post reports, involves Iowa Republican voters gathering at local precincts, undergoing procedural activities, listening to campaign speeches and casting ballots for their preferred presidential candidate. The process...