As part of an attempt to prevent rebellion at the Republican convention, Donald Trump will not let any Republicans who have not endorsed him speak at the party’s July gathering in Cleveland, Ohio, according to the New York Times.

“If there’s no endorsement, then I would not invite them to speak,” Trump told the New York Times in an interview published Sunday.

The presumptive Republicans presidential nominee specifically said that former primary rivals Sen. Ted Cruz (R-TX) and Ohio Gov. John Kasich would not be able to speak if they refuse to back Trump as the nominee.

The New York Times also reported that the Republican National Committee is working to prevent a delegate revolt at the convention: