Live Coverage of the 4th GOP Presidential Primary Debate

Tonight, a special edition of Essential Edition with David Stockton.

Live coverage of tonight's GOP presidential primary debate hosted by Elizabeth Vargas, Megyn Kelly & Eliana Johnson of NewsNation, SiriusXM and the Washington Free Beacon, from the Moody Music Hall on the campus of the University of Alabama in Tuscaloosa, Alabama.

Tonight's debate will be followed by a special edition of Essential Edition with post-debate analysis and the day's top stories.