Iowa's first-in-the-nation GOP caucus date has officially been set for Jan. 15, kicking off a frantic countdown to what many Republicans see as their best chance to stop former President Trump from romping to re-nomination.
Why it matters: A Trump loss or close result in Iowa would scramble expectations and upend the entire primary. A landslide victory could clear the way for a 2020 rematch with President Biden, tying the fate of every Republican on the ballot to the twice-indicted former president.