Mike Mazzei secured the Republican nomination for Oklahoma governor. President Donald Trump's social media attacks boosted Mazzei's campaign significantly. Mazzei will now face Democratic nominee Cyndi Munson in November. The race saw substantial spending on television and digital advertising. Mazzei, a businessman, previously served twelve years in the state Senate.

Trump-backed Mike Mazzei finished the primary less than one percentage point behind Gentner Drummond, who has disagreed with Trump on tariffs.

Tulsa businessman Mike Mazzei is hoping to win a hotly contested Republican primary runoff for Oklahoma governor against state Attorney General Gentner Drummond.