Rule 24.02: Permissive Intervention.

Upon timely motion any person may be permitted to intervene in an action: (1) when a statute confers a conditional right to intervene; or (2) when a movant's claim or defense and the main action have a question of law or fact in common. In exercising discretion the court shall consider whether or not the intervention will unduly delay or prejudice the adjudication of the rights of the original parties.