A federal appeals court on Friday refused to stop a sweeping challenge to abortion regulations in Louisiana, but the ruling requires the plaintiffs to show why they believe they have a legal foundation to bring their claims in the first place.

The U.S. Court of Appeals for the Fifth Circuit’s unsigned ruling rejected the state’s request for a writ of mandamus, a rare order that could have stopped the claims short before they’re fully aired. The case was closely watched, as a ruling in favor of Louisiana could have had broader implications across the Fifth Circuit. Lawyers for Texas and Mississippi supported Louisiana’s push to stop the federal litigation from proceeding.