Members of a Wisconsin Indian tribe could withhold nearly $1 million in casino payouts to the state as part of a dispute surrounding the expansion of a nearby tribe’s gambling operation, documents show.

In a letter to Gov. Scott Walker this week, Stockbridge-Munsee President Shannon Holsey announced the tribe would withhold a scheduled $923,000 payment to the state. The letter says a $33 million expansion of the Ho-Chunk casino in Wittenberg is a violation of both federal law and the Ho-Chunk Nation’s casino compact with the state. The Wisconsin Department of Administration determined in September the expansion does not violate the state compact.

Walker administration spokesman Steve Michels said “the state expects the Stockbridge to adhere to the terms of their compact.”