Internal Revenue Code of 1986, the following rules shall apply: (1) The action shall be filed in the United States District Court for the District of Columbia and an appeal from the decision of the district court may be taken to the Court of Appeals for the District of Columbia Circuit. (2) In the case of an action relating to declaratory or injunctive relief to challenge the constitutionality of a provision, the party filing the action shall concurrently deliver a copy of the complaint to the Clerk of the House of Representatives and the Secretary of the Senate. (3) It shall be the duty of the United States District Court for the District of Columbia and the Court of Appeals for the District of Columbia Circuit to advance on the docket and to expedite to the greatest possible extent the disposition of the action and appeal. (b) Clarifying scope of jurisdiction If an action at the time of its commencement is not subject to subsection (a), but an amendment, counterclaim, cross-claim, affirmative defense, or any other pleading or motion is filed challenging, whether facially or as-applied, the constitutionality or lawfulness of this Act or of chapter 95 or 96 of the Internal Revenue Code of 1986, or is brought to with respect to any action of the Commission under chapter 95 or 96 of the Internal Revenue Code of 1986, the district court shall transfer the action to the District Court for the District of Columbia, and the action shall thereafter be conducted pursuant to subsection (a). (c) Intervention by Members of Congress In any action described in subsection (a) relating to declaratory or injunctive relief to challenge the constitutionality of a provision, any Member of the House of Representatives (including a Delegate or Resident Commissioner to the Congress) or Senate shall have the right to intervene either in support of or opposition to the position of a party to the case regarding the constitutionality of the provision. To avoid duplication of efforts and reduce the burdens placed on the parties to the