For the purposes of reviewing or amending the agreement embodying the simplification requirements as contained in § 67-6-806, the state of Tennessee shall enter into multi-state discussions and shall be represented in such discussions by the following four (4) delegates: the commissioner of revenue or the commissioner’s designee; one (1) member of the house of representatives appointed by the speaker of the house of representatives; one (1) member of the senate appointed by the speaker of the senate; and the comptroller of the treasury.