4 Republicans on stage for the 4th debate: Who's in, who's out

The fourth Republican presidential debate will feature four candidates: Ron DeSantis, Nikki Haley, Vivek Ramaswamy, and Chris Christie. DeSantis has faced challenges within his campaign, while Haley has benefited from increased attention. Ramaswamy, a political newcomer, has struggled to gain traction. Christie has positioned himself as a vocal critic of Trump. Donald Trump is skipping the debate, continuing his pattern of not participating. Asa Hutchinson, who participated in the first debate, failed to qualify for subsequent ones. Tim Scott dropped out of the race after barely qualifying for the third debate.