The U.S. Supreme Court declined on Monday to hear a challenge based on constitutional free speech protections to a voter-approved measure in Alaska that required greater public disclosure of certain political donations as the justices passed up a chance to further curtail campaign finance regulation.

The U.S. Supreme Court on Monday left in place campaign disclosure requirements that Alaska voters approved through a 2020 ballot measure. The justices rejected without explanation an appeal filed by several Alaska voters and groups.