Wanna see a very scary NFL star mocking President Trump? Well, here ya go ...
James Harrison -- the monster pass rusher who played with the Patriots last year -- says the thought of his former team visiting the White House is hilarious ... and he's pointing to that burger debacle with Clemson.
Remember, when Clemson won the National Championship in January, Trump treated the players to cold hamburgers and pizza from his favorite fast food joints ... including McDonald's, Burger King and Domino's.