Former Vice President Mike Pence is endorsing Republican Karrin Taylor Robson in the Arizona governor’s race, pitting himself against Donald Trump in a primary that is emerging as a proxy fight between the former president and Republicans who resisted his efforts to overturn the 2020 election results…

In Arizona, Pence is joining term-limited Republican Gov. Doug Ducey in endorsing Robson. Ducey, like Kemp, also refused to go along with Trump’s push to overturn the election results, in another state that was narrowly won by President Joe Biden. While the Trump-backed Lake has centered her campaign around the unfounded claim that the election was stolen, Robson has refused to say so.

In a statement, Pence called Robson, a real estate developer and former member of the state’s board of regents, “the best choice for Arizona’s future,” and he said he was “proud to support her” ahead of the Aug. 2 primary.

Pence, who is considering a bid for president in 2024, has been stepping up his criticism of Trump. During a March appearance before a Republican National Committee-hosted donor retreat in New Orleans, Pence made a veiled jab at Trump over his relationship with Russian President Vladimir Putin, and Pence also spoke out against his relitigation of the last election, declaring that “elections are about the future.”