The Stockbridge-Munsee Community of Wisconsin operates the North Star Mohican Casino in Bowler.(Photo: File/Press-Gazette Media)

MADISON – The Ho-Chunk Nation is demanding that another tribe drop its casino lawsuit, suggesting in a sternly worded letter it may pursue legal penalties if it doesn't do so.

In the letter, Ho-Chunk attorney Lester Marston also raised the possibility of filing defamation lawsuits against officials with the Stockbridge-Munsee Community for public statements that the Ho-Chunk call untrue.

Marston sent the letter Thursday, a day after the Stockbridge sued the Ho-Chunk, the state and Gov. Scott Walker over a planned expansion of a Ho-Chunk casino in Wittenberg. The Stockbridge own a casino in nearby Bowler and say the expanded Ho-Chunk casino would reduce their revenue by millions of dollars a year.

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Thursday's letter underscores just how nasty the legal fight could get.