(1) The chief justice may by written order assign a district judge to hold court in a county of another district if: (a) for any cause a district court in another district is not or cannot be held in any county by a judge of the other district or acting for the other district; or (b) the business of the court in the other district is not or cannot be dispatched with reasonable promptness. (2) A district judge assigned to another district pursuant to subsection (1) shall hold court in the other district for the time specified in the order.
Authority Of Chief Justice
Mont. Code Ann. § 3-5-112, under Definition of Districts and Assignment of Judges.
Mont. Code Ann. § 3-5-112