Oklahoma Governor Kevin Stitt has chosen Alan Armstrong, an oil and gas executive, to finish out the remainder of Sen. Markwayne Mullin’s term, three sources told NOTUS.

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 advisor 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.

Representatives for Armstrong and Stitt did not return a request for comment. The White House did not respond to a request for comment.

In accordance with Oklahoma law, Armstrong will be required to sign a sworn affidavit saying he will not seek election to a full six-year Senate term and instead will only serve out the remainder of Mullin’s current term.

Rep. Kevin Hern has already essentially cleared the field in the race for the Senate seat.

This article has been updated with additional information.