The big headlines since the last debate
It's been four weeks since Republican primary contenders last met on stage. A lot has happened between then and now.
Two candidates dropped out of the race: South Carolina Sen. Tim Scott and North Dakota Gov. Doug Burgum.
Their exits whittled down the field down to five major candidates, though Trump remains the front-runner with two candidates now vying for second place in the polls: DeSantis and Haley. All three recently received notable endorsements with voting just weeks away. The Koch-backed group Americans for Prosperity Action threw its support behind Haley over Trump while DeSantis has earned key endorsements in Iowa, including from Gov. Kim Reynolds and Trump, despite his absence, just got the backing of Alabama Sen. Katie Britt.
This is the last chance for candidates to get a boost on the national stage before next month's Iowa caucuses and the New Hampshire primary.
-ABC News' Alexandra Hutzler