A compromise offer from Gov. Janet Mills on tribal sovereignty sparked an ugly Friday dispute with a Bangor lawmaker who accused the governor of trying to subvert the effort by letting tribes run a new mobile sports betting market.

Language for a potential deal between Mills and tribes was still in the works on Friday, but a summary of the proposal from the Democratic governor’s office obtained by the Bangor Daily News said federally recognized tribes in Maine would be the only groups eligible to get mobile sports betting licenses. Casinos that have been seeking the business would be cut out. Mills vetoed a sports betting measure in 2020 over concerns about expanding gambling in Maine.