U.S. Senator from Oklahoma

Alan Armstrong

Republican · Oklahoma

Energy executive who led the pipeline company Williams as chief executive from 2011 to 2025. Appointed to the Senate by Governor Kevin Stitt on March 24, 2026, after Markwayne Mullin resigned to become Secretary of Homeland Security. Holds no prior elected office.

Record

Appointed in March 2026 with no prior record in elected office. A career in oil and gas infrastructure shapes his emphasis on pipeline permitting, natural gas exports, and Oklahoma's energy sector. Serving an interim term that ends January 3, 2027, with the seat on the November 2026 ballot.

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