David Maxwell, former Texas Ranger and top aide to Texas Attorney General Ken Paxton, is sworn in on day four of Paxton's impeachment trial in the Texas Senate on Sept. 8, 2023.

Credit: Texas Tribune / Bob Daemmrch David Maxwell, the former top cop under Attorney General Ken Paxton, has endorsed Paxton's opponent, James Talarico, for U.S. Senate.

Maxwell spent nearly 50 years working in law enforcement in Texas, as a Texas Ranger, a sergeant in the Texas Department of Public Safety and the director of law enforcement for the attorney general's office for nearly a decade.