火曜日に行われたアイオワ州知事選の共和党予備選挙で、ザック・ラーン氏がトランプ前大統領の支持を受けたランディ・フェーンストラ下院議員を2,000票未満の僅差で破り、指名を獲得した。この番狂わせにより、予備選でのトランプ氏の連勝記録が止まった。
得票率はラーン氏が37.79％、フェーンストラ氏が37.01％だった。3期務める現職下院議員のフェーンストラ氏は、年初から求めていたトランプ氏の推薦を予備選のわずか4日前に取り付けたばかりだった。フェーンストラ氏は敗北を認め、11月の本選で民主党のロブ・サンド氏と対決するラーン氏を支持すると誓った。実業家で元共和党工作員のラーン氏は、MAHA ActionやTurning Point Actionといった政治活動委員会（PAC）の支援を受け、アウトサイダーとして選挙戦を展開した。選挙戦において、フェーンストラ氏はラーン氏を約100万ドル上回る選挙資金を投じていた。今回の予備選は、キム・レイノルズ共和党州知事が再選を目指さないと決定したことを受けて行われた。
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President Donald Trump on Friday, May 29, 2026, endorsed three Republican candidates for governor—South Carolina Lt. Gov. Pamela Evette, U.S. Rep. Randy Feenstra of Iowa, and former Oklahoma state Sen. Mike Mazzei—issuing the backing in separate social media posts as key primaries near.
Iowa Democrats emerged from the June 2 primaries with State Auditor Rob Sand as their nominee for governor and state Rep. Josh Turek as their nominee for U.S. Senate, setting up two high-profile general-election races in a state Republicans have dominated in recent cycles.
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Georgia Secretary of State Brad Raffensperger lost the Republican primary for governor on May 19. MAGA billionaire Rick Jackson and Lt. Gov. Burt Jones advanced to a runoff. The outcome highlights President Donald Trump’s influence in the party.
Vivek Ramaswamy, a wealthy biotech entrepreneur and former presidential candidate, won the Ohio Republican primary for governor on Tuesday. He defeated challenger Casey Putsch with a comfortable margin and will face Democrat Amy Acton in November. The race is expected to be competitive in the Republican-leaning state.
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The U.S. Supreme Court on Thursday refused to overturn lower court decisions removing Samuel Ronan from Ohio's Republican primary ballot for the 15th Congressional District. Ohio Secretary of State Frank LaRose had disqualified Ronan, who previously sought the Democratic National Committee chairmanship, citing his admitted intent to run Democrats in Republican primaries. No justices dissented from the decision.
Jackson Lahmeyer, the evangelical pastor from Owasso, Oklahoma, and founder of Pastors for Trump, announced on Tuesday his candidacy for a U.S. House seat in Tulsa's district. The seat, currently held by Rep. Kevin Hern, has opened due to Hern's plans to seek a Senate position vacated by Markwayne Mullin. Lahmeyer positions himself as a bold supporter of President Trump's agenda.
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Louisiana voters headed to the polls on Saturday for the Republican primary in the U.S. Senate race. Incumbent Sen. Bill Cassidy faced challenges from Rep. Julia Letlow and state Treasurer John Fleming amid heavy involvement from President Donald Trump.