Former Oklahoma Budget Secretary Mike Mazzei defeated state Attorney General Gentner Drummond in the GOP primary runoff to determine the Republican nominee for Oklahoma governor on Tuesday.

Mazzei pulled out the GOP runoff win with 50.3% of the vote compared to Drummond’s 49.7%, according to the Associated Press on Tuesday evening. Mazzei’s victory notches another win for President Donald Trump‘s endorsement power, as Mazzei joins Rep. Byron Donalds (R-FL) as the latest Trump-backed gubernatorial candidate to win their primary in a midterm election season that has shown mixed results for the president’s endorsement in gubernatorial races.