Washington Redskins offensive tackle Trent Williams has accused NFL umpire Roy Ellison of swearing at him during Sunday’s disappointing 24-16 loss in Philadelphia.

An NFL spokesperson confirmed that the league is looking into the matter.Williams said that Ellison called him a “a garbage ass disrespectful mother(expletive),” according to Grant Paulsen of WJFK-FM in Washington.

“I just don’t think there’s no room for you to have to take that from the team and the refs,” Williams said.