1. When the constitutionality of an Act of the Iowa legislature is drawn into question in any appellate proceeding or further review proceeding to which the general assembly or an officer, agency, or employee thereof is not a party, the majority leader of the senate, the minority leader of the senate, the speaker of the house of representatives, and minority leader of the house of representatives shall each be permitted to file an amicus curiae brief on the constitutionality of the Act. Other members of the general assembly may sign an amicus curiae brief filed pursuant to this subsection. The form of the brief shall be as provided in
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2. A member of the general assembly shall not sign more than one amicus curiae brief in an appellate proceeding or further review proceeding, including briefs filed pursuant to this section and pursuant to other provisions of law.