Mont. R. Civ. P. 24

(a) Intervention of Right. On timely motion, the court must permit anyone to intervene

who:

(1) is given an unconditional right to intervene by statute; or

(2) claims an interest relating to the property or transaction which is the subject of the

action, and is so situated that disposing of the action may as a practical matter impair

or impede the movant’s ability to protect its interest, unless the existing part ies

adequately represent that interest.

(b) Permissive Intervention.

(1) In General. On timely motion, the court may permit anyone to intervene who:

(A) is given a conditional right to intervene by statute; or

(B) has a claim or defense that shares with the main action a common question

of law or fact.

(2) By a Government Officer or Agency. On timely motion, the court may permit a

state governmental officer or agency to intervene if a party’s claim or defense is based

on:

(A) a statute or executive order administered by the officer or agency; or

(B) any regulation, order, requirement, or agreement issued or made under the

statute or executive order.

(3) Delay or Prejudice. In exercising its discretion, the court must consider whether

the intervention will unduly delay or prejudice the adjudication of the original parties’

rights.

(c) Notice and Pleading Required. A motion to intervene must be served on the parties

as provided in Rule 5. The motion must state the grounds for intervention and be

accompanied by a pleading that sets out the claim or defense for which intervention is

sought.