Arizona held primary elections on July 21, 2026, which serve as a test of former President Donald Trump's influence within the Republican Party. Trump's endorsements are significant in several key races, including the gubernatorial nomination where he supports Rep. Andy Biggs, who is competing against other candidates including Rep. David Schweikert and Scott Neely. The winner will face Democratic Gov. Katie Hobbs in the general election.
In Arizona's 1st Congressional District, Trump endorsed Jay Feely, a former NFL player, who is running against Joseph Chaplik and John Trobough for the GOP nomination. The Democratic primary features a rematch between Marlene Galán-Woods and Amish Shah.
In the 5th District, Trump backs former Sheriff Mark Lamb, who is facing Daniel Keenan amid allegations against him. Despite controversies, Trump reaffirmed his support for Lamb.
Trump's endorsement power has been evident in recent GOP primaries, with mixed results. His candidates have succeeded in several states but faced setbacks, including a loss in Iowa. The outcomes of these primaries could influence the GOP's control of the House of Representatives.