Rule 24. Intervention

(a) Intervention of Right.  On timely motion, the court must permit anyone to intervene who:
    (1) is given an unconditional right to intervene by a federal statute; or
    (2) claims an interest relating to the property or transaction that 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 existing parties 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 a federal statute; or
        (B) has a claim or defense that shares with the main action a common question of law or fact.
. . .

    (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.