Which four Republicans will be on stage for the fourth presidential debate?

Just four Republicans will be on stage Wednesday for the fourth Republican presidential debate at the University of Alabama in Tuscaloosa, the Republican National Committee announced Monday evening.

Former New Jersey Gov. Chris Christie, Florida Gov. Ron DeSantis, Former Ambassador to the U.N. Nikki Haley, businessman Vivek Ramaswamy are the four who met the qualifications, the smallest field yet to take the stage during the GOP primary campaign.

The threshold set by the RNC was the highest set so far, demanding candidates reach at least 6% support in two national polls or 6% in one national poll as well as two polls from four of the early-voting states — Iowa, New Hampshire, Nevada and South Carolina. The RNC approved the polls that would qualify candidates. And candidates also needed a minimum of 80,000 unique donors, with at least 200 from 20 states or territories. 

And participants also had to sign a pledge promising to support the party's eventual nominee.