| (1) | In any matter, including any appeal, where there is a dispute over the constitutionality of any executive or administrative act or conduct or threatened executive or administrative act or conduct, or in any inquiry into the constitutionality of any law, including any Act of Parliament or that of a provincial legislature, and the authority responsible for the executive or administrative act or conduct or the threatening thereof or for the administration of any such law is not cited as a party to the case, the party challenging the constitutionality of such act or conduct or law shall, within five days of lodging with the Registrar a document in which such contention is raised for the first time in the proceedings before the Court, take steps to join the authority concerned as a party to the proceedings. |
