Tenn. Const. art. VI, § 11

No Judge of the Supreme or Inferior Courts shall preside on the trial of any cause in the event of which he may be interested, or where either of the parties shall be connected with him by affinity of consanguinity, within such degrees as may be prescribed by law, or in which he may have been of counsel, or in which he may have presided in any inferior Court, except by consent of all the parties. In case all or any of the Judges of the Supreme Court shall thus be disqualified from presiding on the trial of any cause or causes, the Court, or the Judges thereof, shall certify the same to the Governor of the State, and he shall forthwith specially commission the requisite number of men, of law knowledge, for the trial and determination thereof. The Legislature may by general laws make provision that special Judges may be appointed, to hold any Courts the Judge of which shall be unable or fail to attend or sit; or to hear any cause in which the Judge may be incompetent.