U.S. Senate · researched profile
Appointed U.S. Senator from Oklahoma — service through January 3, 2027
Alan Armstrong is a Republican U.S. senator from Oklahoma who was sworn in on March 24, 2026 after appointment to the seat vacated when Markwayne Mullin became Secretary of Homeland Security. His official biography states that the appointment runs through January 3, 2027 and that he is not seeking election to the seat.
Profile updated Aug 20, 2026
Newest first
Alan Armstrong is a Republican U.S. senator from Oklahoma who was sworn in on March 24, 2026 after appointment to the seat vacated when Markwayne Mullin became Secretary of Homeland Security. His official biography states that the appointment runs through January 3, 2027 and that he is not seeking election to the seat.
Open biography & office record ↓Alan Armstrong is a Republican U.S. senator from Oklahoma who was sworn in on March 24, 2026 after appointment to the seat vacated when Markwayne Mullin became Secretary of Homeland Security. His official biography states that the appointment runs through January 3, 2027 and that he is not seeking election to the seat.
Before entering the Senate, Armstrong spent decades at Williams Companies, serving as president and CEO from 2011 to 2025 and executive chairman until March 2026. He is a civil engineer by training and previously served on the National Infrastructure Advisory Council.
In the 119th Congress, Armstrong serves on the Senate Health, Education, Labor and Pensions Committee and the Indian Affairs Committee. This editorial entry records the temporary appointment and institutional responsibilities without inferring policy positions or wrongdoing from his prior industry career.
