A judge is set to hear arguments Tuesday over a proposed Indian gaming casino along Highway 99 in Madera County.
Opponents of the casino, a gambling watchdog group known as Stand Up California, are expected to present their case in Madera Superior Court.
Gov. Jerry Brown has already OK'd the casino.
But opponents say he did not have authority to grant the "North Fork Rancheria of Mono Indians" permission, because the land is not yet in federal trust -- the process needed for a tribe to take over of a piece of land.
The casino would be built more than 30 miles from the tribe's traditional lands near Yosemite.
Supporters say a casino could not be built at the tribe's current location.