Texas Government Code - GOV'T § 301.061. Legal Representation of Legislature

(a) Subject to the requirements of Subsection (b) and to the exception provided in Subsection (c), the legislature, after notifying and consulting the attorney general, may employ counsel, or authorize the counsel of a legislative agency, to file suits on behalf of the legislature, to intervene in pending litigation on behalf of the legislature, or to otherwise represent the legislature in the courts of this state or in the courts of the United States.

(b) Representation of the legislature under this section is authorized only if:

(c) Subsection (a) does not apply to the representation of the interests of the legislature before the Supreme Court of Texas in violation of Article IV, Section 22, of the Texas Constitution.

(d) A member of the legislature is immune from civil liability resulting from the legislature's participation in litigation under this section, including liability for attorney fees, costs, and sanctions that may be awarded in the litigation.  This subsection is cumulative of the common law immunity applicable to the conduct of members of the legislature.