Iowa Code § 39.28: Actions — intervention.

1. A political party, as defined in section 43.2, or a nonparty political organization organized pursuant to chapter 44, may intervene in a proceeding under chapter 17A or an action filed in the district court, court of appeals, or supreme court to challenge a provision of this chapter and chapters 39A through 62 or a rule adopted to implement such a provision.

2. A political party, as defined in section 43.2, or a nonparty political organization organized pursuant to chapter 44, may petition the district court to modify or vacate an injunction against the enforcement of a provision of this chapter and chapters 39A through 62. A denial of a petition to modify or vacate an injunction is appealable as a matter of right as a final judgment.