The U.S. Department of the Interior has twice approved Stations Casinos agreement build a new casino near Sacramento on Indian land, but that's not good enough.
Opponents have promised to sue the Department within the 30-day appeal window using three possible legal arguments.
Tribal attorney Howard Dickstein labeled the promised lawsuit "frivolous" and predicted a judge will decline to block construction.
Stations Casinos said in a statement that it intends to begin construction on the $100 million casino near Interstate 80 and Sacramento. The proposal is considered the biggest Indian threat to the Reno area casino operators.