U.S. Rep. Steve Stockman, R-Friendswood, has filed to run against U.S. Sen. John Cornyn in the March GOP primary, joining at least eight other hopefuls vying for the senior senator’s seat, according to a spokesman with the Republican Party of Texas.

Stockman, who had filed for re-election in Congressional District 36, had to withdraw from that race to seek Cornyn’s seat.

In an interview with the website WND, Stockman said he was running because he was “extremely disappointed in the way [Cornyn] treated his fellow congressmen and broke the 11th commandment and undermined Ted Cruz’s fight to stop Obamacare.”