Okla. Governor Names Mullin's Senate Replacement

Energy exec Alan Armstrong will serve through the end of the year
By Newser Editors and Wire Services
Posted Mar 24, 2026 9:10 AM CDT
Okla. Gov Picks Energy Exec to Fill Mullin's Senate Seat
The Capitol is framed amid blooming cherry trees in Washington, Monday, March 23, 2026.   (AP Photo/J. Scott Applewhite)

Oklahoma's governor on Tuesday appointed energy executive Alan Armstrong to serve in the US Senate through the end of the year and finish the term of Republican Markwayne Mullin, the new homeland security secretary. The choice by Republican Gov. Kevin Stitt, who had pledged to pick a "conservative voice" to fill Mullin's seat, elevates to the Senate the chairman and former CEO of Williams Companies, a major pipeline operator based in Tulsa. Mullin, who was confirmed on Monday to take over the embattled Department of Homeland Security, would have been up for reelection in November, reports the AP.

The last nine months of his term will now be filled by Armstrong, who under Oklahoma law must agree to not run for a full term this fall. Republican US Rep Kevin Hart quickly announced his candidacy for the Senate seat and has already been endorsed by President Trump. Armstrong, who has never served in elected office, has spent his career with Williams Companies, which employs about 5,800 people and specializes in the collection, storage, and transportation of natural gas. He became president and CEO in 2011 and transitioned to executive chairman last year. He is a longtime supporter of Stitt, giving him $8,500 in total campaign contributions since 2018, the maximum amount allowed under Oklahoma law.

Stitt, who will leave office in January and is head of the National Governors Association, made the pick weeks after Trump lashed out at him following a dispute over who was allowed at the group's annual meeting. Former Tulsa Mayor Dewey Bartlett Jr., described Armstrong as an "even-tempered individual" who is more likely to build consensus around a decision rather than being driven by political ideology. Bartlett, whose father served in the Senate in the 1970s, said Armstrong's knowledge of the energy industry and its market factors also make him an ideal selection, particularly as the Iran war rattles the global flow of oil. "I think that certainly is a great approach, finding consensus for making a decision," said Bartlett, the president of an oil and gas company.

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