Former Vice President Mike Pence will headline a get-out-the-vote rally with Gov. Brian Kemp on the eve of Georgia’s May 24 primary, marking a new split with Donald Trump as each maneuver for a possible 2024 White House run.

Pence called Kemp “one of the most successful conservative governors in America” in a statement announcing the May 23 rally to help the incumbent stave off a Trump-backed challenge from former U.S. Sen. David Perdue.

The event announced Friday underscores a growing proxy fight in Georgia between establishment forces backing Kemp and the Trump loyalists who want to remake the state Republican party in the former president’s mold.