Tenn. Code Ann. § 17-2-115

When any judge of any circuit court, criminal court, or chancellor, or judge or chancellor of any special court of equal dignity with circuit or chancery court, certifies to the governor that the judge or chancellor is incompetent to hold the judge's or chancellor's court, or to try any cause or causes pending in the judge's or chancellor's court, the governor shall appoint some person learned in the law and constitutionally qualified to discharge the duties of the office of judge or chancellor, to hold the court or try the cause or causes.