Four candidates will be on stage for Wednesday’s GOP presidential primary debate in Alabama, including a surprise last-minute inclusion of former New Jersey Gov. Chris Christie.

The Republican National Committee announced late Monday that Florida Gov. Ron DeSantis, former U.N. ambassador Nikki Haley, businessperson Vivek Ramaswamy and Christie will appear at the University of Alabama.

DeSantis, Haley and Ramaswamy all easily cleared the requirements set by the national party committee to make it on stage. But Christie’s inclusion came at the........

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