A North Dakota attorney took a second shot at convincing a federal appeals court that mandatory bar dues are unconstitutional, this time relying on the U.S. Supreme Court’s recent landmark ruling involving public-sector labor union dues to bolster his case.

The justices remanded the North Dakota case to the U.S. Court of Appeals for the Eighth Circuit for reconsideration in the wake of its 5-4 decision in Janus v. AFSCME last year. That decision has sparked a flood of challenges to mandatory bar membership and dues in states such as Oklahoma, Oregon, Texas and North Dakota.