Oklahoma Gov. Kevin Stitt Appoints Oil & Gas Executive Who Reportedly Donated to Adam Kinzinger to Fill Mullin’s Senate Seat

Oklahoma Governor Kevin Stitt has chosen oil and gas executive Alan Armstrong to fill the U.S. Senate seat being vacated by Sen. Markwayne Mullin.

The move comes as Mullin barrels toward confirmation as President Trump’s Secretary of Homeland Security.

President Donald Trump announced that Oklahoma Senator and undefeated MMA fighter Markwayne Mullin will lead the Department of Homeland Security (DHS) effective March 31.

If Mullin is confirmed and leaves the Senate, Kevin Stitt, the Republican governor of Oklahoma, will be required to appoint a temporary replacement to serve until voters choose a senator in the next election.

Under Oklahoma law, Governor Kevin Stitt will have 30 days to appoint a temporary U.S. senator to fill the vacancy until voters decide the seat in the next election.

The appointee will serve only briefly and is expected to sign an oath promising not to run for the seat in the upcoming election, a measure designed to prevent the advantages of incumbency in the race.

According to NOTUS, citing three sources, Stitt selected Armstrong, a longtime energy executive and former CEO of Williams Companies, to serve out the remainder of Mullin’s term.

The news outlet reported that Armstrong and Stitt were expected to meet with President Donald Trump at Mar-a-Lago to finalize the decision.

Reports reveal Armstrong previously donated $5,800 to former Rep. Adam Kinzinger, one of the most vocal anti-Trump Republicans.

The two men are expected to meet with President Donald Trump at Mar-a-Lago on Sunday to iron out the details of the appointment and discuss it further, two of the sources said.

The sources cautioned that the pick could change following that meeting.

In March 2021, Armstrong gave $5,800 to former Rep. Adam Kinzinger, who voted to impeach Trump, according to FEC records. Sources said the donations are likely to be a topic of conversation at Mar-a-Lago.

Armstrong, who chairs the board of directors for the energy company Williams, was one of three main names Stitt presented in meetings he had in Washington, D.C., earlier this month. While multiple names were floated, Stitt was focused on three people: his senior adviser Dustin Hilliary, oil baron Harold Hamm and Armstrong.

Stitt is expected to announce the appointment shortly after Mullin is officially confirmed by the Senate as secretary of the Department of Homeland Security, as early as Sunday.

Could be an interesting meeting, given that Armstrong gave fierce Trump critic Adam Kinzinger thousands of dollars after he voted to impeach Trump… https://t.co/0kaczVxMRW

— Kevin Corke (@kevincorke) March 22, 2026

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