The fourth Republican presidential primary debate is set to take place at the University of Alabama in Tuscaloosa. The debate, hosted by NewsNation, The Washington Free Beacon, and The Megyn Kelly Show on Sirius XM, will feature four candidates: Florida Governor Ron DeSantis, former US Ambassador to the United Nations Nikki Haley, tech entrepreneur Vivek Ramaswamy, and former New Jersey Governor Chris Christie.

This debate comes at a critical time for the candidates as the window to dent Donald Trump's lead narrows. Trump remains the frontrunner according to opinion polls, with a significant lead over the other candidates. However, DeSantis and Haley are currently vying for second place in the primary election polls.

The Republican National Committee determines who participates in the debates based on specific criteria. For this fourth debate, candidates needed a minimum of 80,000 unique donors, with at least 200 donors from 20 states or territories.

The debate will be livestreamed on the NewsNation website and broadcasted on television news channels. Additionally, it will be streamed on Rumble, a video-hosting service popular among conservatives. The moderators for the debate will include NewsNation anchor Elizabeth Vargas, Megyn Kelly, and Eliana Johnson, the editor-in-chief of The Washington Free Beacon.

With the field narrowing and the stakes getting higher, the fourth Republican presidential primary debate will be crucial for the candidates to make their case to Republican voters before the party's nominating contest begins next month.