Alan Armstrong Appointed as U.S. Senator from Oklahoma
In a notable move, Oklahoma’s Republican Governor Kevin Stitt has appointed Alan Armstrong, an executive from Tulsa Energy Company, to fill the U.S. Senate seat left vacant by Markwayne Mullin, who was recently appointed as Secretary of Homeland Security.
Stitt made this announcement during a morning press conference at the State Capitol, highlighting the significance of Armstrong’s experience in the energy sector as the Senate grapples with pressing federal energy policy issues.
Armstrong officially took the oath of office on Tuesday afternoon, with Senate President pro tempore Chuck Grassley presiding over the ceremony. This appointment comes at a crucial time, ensuring that Oklahoma is represented as the Senate navigates a busy legislative agenda this spring.
He will serve in an interim capacity alongside Oklahoma State Senator James Lankford, staying on until the general election results are certified on November 3, 2026. After that, he’s not eligible to run in that election, as per state law.
Governor Stitt underlined that Armstrong’s appointment reflects a need for a conservative leader focused on infrastructure and regulatory reform. “Alan’s story embodies the essence of Oklahoma,” he noted, emphasizing the state’s values and work ethic.
Armstrong, 63, has a long history at Williams Companies, a prominent natural gas company based in Tulsa, where he held various leadership roles, including president and CEO for 14 years before becoming executive chairman in 2025. As he steps into the Senate, he aims to push for substantial reforms. Armstrong mentioned that he consulted with leaders like President Donald Trump and Senate Majority Leader John Thune during his appointment discussions.
He stressed the challenges associated with large-scale infrastructure projects, noting, “The truth is, building large-scale infrastructure has become very difficult.” He acknowledged that his experience in the energy field gives him valuable insight into the regulatory challenges the nation faces, and he plans to focus on securing reforms that bolster U.S. interests.
Armstrong reflected on his decision to enter the Senate, admitting it wasn’t easy but felt necessary. He shared, “I didn’t want to look back and think I could have made a difference but didn’t.”
Understanding the Interim Appointment
Armstrong will hold the senator pro tempore title until the general election results are finalized on November 3, 2026. According to Oklahoma’s Vacancies Act, his interim role will conclude when a permanent replacement is sworn in, expected to occur in January 2027.
Interim appointees are required by law to be from the same political party as the outgoing senator for at least five years before their appointment. They must also take a legally binding oath affirming they won’t seek office in the upcoming election, aimed at curtailing the advantages of incumbency.
Possible Candidates for the Permanent Position
Oklahoma Republican Congressman Kevin Hahn is emerging as a prime contender for the permanent Senate seat. His campaign has gained momentum with early endorsement from President Trump, who has described Hahn as a “warrior” for the America First agenda. Hahn is emerging as the favorite after Congresswoman Stephanie Bice decided to seek re-election in the House instead of challenging him.
A Shift in the Senate Landscape
The vacancy arose following Mullin’s confirmation to head the Department of Homeland Security, which was approved by the Senate with a 54-45 vote. Mullin, a Cherokee Nation member and former MMA fighter, has been part of the U.S. Senate since 2023.
Armstrong’s entry does not alter the current balance of power in the Senate, where Republicans hold a 53-47 majority. However, his extensive ties within the energy sector and previous positions, including chairman of the National Petroleum Council, position him as a pivotal player in future discussions surrounding energy policy.
