Arizona's Republican primary elections on Tuesday are being viewed as a key test of President Donald Trump's continued dominance over the GOP, with control of the House majority and the governor's race among the stakes. Trump has already backed a string of successful candidates through the 2026 primary season, including securing a win for Ken Paxton over former Senator John Cornyn in Texas, cementing his reputation as the party's decisive kingmaker.

In Arizona, Trump has endorsed Andy Biggs in the Republican gubernatorial primary, alongside backing several House candidates, betting his political capital on shaping the state's races. Commentators cited in the piece describe the GOP as having effectively become the "MAGA party" under his influence, with the Arizona results set to further indicate whether his endorsement remains a near-guaranteed path to victory ahead of the broader midterm battle for congressional control.