In an interview on Friday with Michael Savage, the right-wing radio host who has taken credit for Trump’s virulent anti-immigrant rhetoric, Donald Trump lashed out at his conservative critics and Republican presidential rivals.

“I read I shouldn’t be on the same stage with some governor who is a nothing or senator who is a nothing,” Trump said. “I’m not saying that a senator is nothing or a governor, I’m saying that some of these people shouldn’t be on the stage.”

Boasting of his business skills and reality TV success, Trump said that his fellow candidates aren’t even worthy of shining his shoes: “You go to the best college and you do great and all of the sudden you’re not supposed to be on a stage and you have other people that frankly can’t shine your shoes and it’s okay for them to be on it.”

Responding to criticism from the National Review, Trump said that William F. Buckley, the publication’s founder, “must be spinning in his grave, they have a bunch of lowlifes over there.”