(b) Challenges, contests or raises as an issue, either in law or in equity, in whole or in part, or facially or as applied, the meaning, intent, purpose, scope, applicability, validity, enforceability or constitutionality of any law, resolution, initiative, referendum or other legislative or constitutional measure, including, without limitation, on grounds that it is ambiguous, unclear, uncertain, imprecise, indefinite or vague, is preempted by federal law or is otherwise inapplicable, invalid, unenforceable or unconstitutional, the Legislature may elect to intervene in the action or proceeding by filing a motion or request to intervene in the form required by the rules, laws or regulations applicable to the action or proceeding. The motion or request to intervene must be accompanied by an appropriate pleading, brief or dispositive motion setting forth the Legislature's arguments, claims, objections or defenses, in law or fact, or by a motion or request to file such a pleading, brief or dispositive motion at a later time.