Who are the candidates challenging Donald Trump for the Republican nomination?

Second Presidential Candidate Commits to Iowa Debate, Both Challenge Trump to Take Part

Ranking the Republicans' Potential 2024 White House Candidates

As 2024 nears, DeSantis, Haley remain opening acts to Trump : NPR

How the Republican presidential primary really works - Vox

Trump attorney in 14th Amendment case defended secretary of state's right to bar candidates from ballot - Colorado Newsline

Trump Crushing DeSantis and GOP Rivals, Times/Siena Poll Finds - The New York Times

How inexperienced candidates and primary challenges are making Republicans the protest party

GOP Debate Key Takeaways: Presidential Candidates Fail to Outshine Trump - WSJ

First GOP debate: What we learned, explainers, analysis - Vox