A pretty powerful NY congressman is taking issue with James Dolan -- telling TMZ Sports he's AGAINST banning fans unless they do something to really deserve it.
We spoke with Rep. Adriano Espaillat (D) -- who represents NY's 13th District, which is comprised of Upper Manhattan and a small part of the Bronx. Basically, Knicks country.
So, we asked Espaillat how he feels about Dolan banning a Knicks fan who shouted at the owner to "sell the team" during Saturday's game at Madison Square Garden ... and it seems he's against it.