Granbury Republican Brian Birdwell is trading the Texas Senate floor for the Pentagon after the U.S. Senate on Monday confirmed him as an assistant secretary of defense, sending the longtime state lawmaker back to familiar territory in Washington. The chamber approved his nomination in a 46-43 vote as part of a larger confirmation package, and with Birdwell already opting not to seek reelection, his District 22 seat is now officially up for grabs in November.
The close vote came in a batch of dozens of nominees, with the 46-43 tally recorded by The Texas Tribune. The White House first sent Birdwell’s nomination to the Senate in October 2025, including his name on a presidential actions list of nominees headed to the upper chamber. That same notice from The White House specified the assistant secretary of defense role he has now secured.
Local political ripple
Back home, the move reshapes the ballot in a hurry. State Rep. David Cook, a Mansfield Republican and former mayor, won the GOP primary for Senate District 22 in March and will carry the party’s banner against Democrat Amy Martinez-Salas this fall, the Fort Worth Star-Telegram reported. Cook pulled in roughly 80% of the primary vote and now turns to a general-election fight in a district that runs from south Fort Worth toward Waco and neighboring communities, giving both parties a clear opening to sharpen their messages and turnout operations in a high-profile open-seat contest.
Birdwell’s return to the Pentagon
In Washington, Birdwell will oversee the sustainment portfolio, a wonky title that translates to the nuts-and-bolts of logistics, supply chains and readiness across the Defense Department. ExecutiveGov reported that he was selected to succeed Christopher Lowman in that post upon confirmation. Birdwell is no stranger to the Pentagon: he previously served on the Department of the Army staff there and survived the Sept. 11, 2001, attack on the building, suffering severe burns in the strike, a history detailed by The Texas Tribune.
What’s next for the seat
The November showdown between Cook and Martinez-Salas will determine who takes over the open District 22 seat, and local strategists are already predicting an aggressive ground game from both sides. Coverage in the Fort Worth Star-Telegram has highlighted the district’s blend of suburban neighborhoods and smaller cities, a political map that tends to reward candidates who invest heavily in door-knocking and local outreach. With Birdwell’s long tenure winding down, the race doubles as a real-time test of Republican strength in this corridor of Central Texas.
On X, Birdwell thanked his constituents and fellow lawmakers as he prepares for the new role, writing, “Let me again thank you for the privilege and honor of serving you for nearly 16 years in the State Senate.” He also used X to thank U.S. Sens. Ted Cruz and John Cornyn for helping steer his nomination through the confirmation process as he makes his move to the Pentagon.
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