A new state law that requires disclosure of major anonymous campaign contributors is facing another legal challenge.
The lawsuit, filed Friday in federal court, comes as the voter-approved Proposition 211 was already challenged in Arizona courts.
Americans for Prosperity and its foundation filed the new lawsuit. The organization, which advocates for limited government, argues the law violates its First Amendment free-speech rights by compelling disclosure of contributors to nonprofits that take positions in political contests, for both candidates and ballot measures.
The lawsuit asks the U.S. District Court in Phoenix to find the law unconstitutional and to issue a permanent injunction barring its enforcement. The argument is similar to the complaint filed in December by the Free Enterprise Club and the Center for Arizona Policy in Maricopa County Superior Court.