Tex. Gov't Code § 74.141

The attorney general shall defend a state district judge, a business court judge, a presiding judge of an administrative region, the presiding judge of the statutory probate courts, a visiting judge assigned to hear a guardianship or probate matter by the presiding judge of the statutory probate courts, or an active, retired, or former judge assigned under this chapter in any action or suit in any court in which the judge is a defendant because of the judge's office or capacity as judge if the judge requests the attorney general's assistance in the defense of the suit.