Tennessee Code Title 20. Civil Procedure § 20-18-105

(a) Pursuant to Article II, Sections 4, 5, and 6 of the Constitution of Tennessee, which vest the power of apportionment with the general assembly, a court, including the supreme court or a three-judge panel, shall not impose a substitute plan for a plan enacted by the general assembly apportioning or redistricting state legislative or congressional districts under this chapter unless the court first gives the general assembly a period of time to remedy any defects identified by the court in the court's findings of fact and conclusions of law. The period of time given must not be less than fifteen (15) calendar days from the issuance of the court's findings of fact and conclusions of law, and in setting the period of time, the court shall consider whether the general assembly is currently in session or out of session.

(b) If the general assembly does not enact a new plan within the period of time set by the court pursuant to subsection (a), then the court may impose an interim districting plan for use only in the next election cycle, provided the interim districting plan differs from the districting plan enacted by the general assembly only to the extent necessary to remedy any defects identified by the court.

(c) A party in an action challenging a statute that apportions or redistricts state legislative or congressional districts that is dissatisfied with the final judgment of the three-judge panel may appeal to the supreme court, as a matter of right, within thirty (30) days from the entry of the judgment of the three-judge panel. The record on appeal must conform to the requirements of Rule 24 of the Tennessee Rules of Appellate Procedure.