Weber

Opinion of the Court by Liu, J.

Petitioners — the Legislature of the State of California, Governor Gavin Newsom, and elector and former Senate President Pro Tempore John Burton — filed this original proceeding seeking a writ of mandate or prohibition to bar the Secretary of State (Secretary) from placing an initiative measure on the November 2024 general election ballot. The measure at issue has been designated Attorney General Initiative No. 21-0042A1 and Secretary of State Initiative No. 1935, and has been named the “Taxpayer Protection and Government Accountability Act” by its drafters. We refer to it as the “TPA.” The petition primarily contends that the TPA is invalid because it attempts to revise the California Constitution via citizen initiative. Petitioners also argue that the TPA is invalid because it would seriously impair essential government functions. Petitioners named Thomas W. Hiltachk, the proponent of the challenged measure (Proponent), as real party in interest. We issued an order to show cause and established an expedited briefing schedule in order to resolve this matter before the date that the Secretary must formally qualify the initiative for the ballot…