BNSF v. Vaughn involves the Hualapai tribe’s attempt to impose taxes on BNSF railroad. BNSF brought an Ex parte Young action against two tribal officials: the chairman and the tax collector, seeking an injunction. The tribe argued that the railroad was required to exhaust its tribal remedies and that the tribe and its officials hadn’t waived tribal immunity. The district court disagreed. Here, the Ninth Circuit held that the tribe could bring an interlocutory appeal of the rejection of the immunity defense, but held that the tax collector was not immune from suit and remanded for further proceedings.
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