Ohio Gov. John Kasich and former Florida Gov. Jeb Bush could be barred from seeking the Republican Party’s presidential nomination in the future if they refuse to get on board with Donald Trump, party chairman Reince Priebus said Sunday.

“I think people need to get outside this Beltway and get on the road,” Priebus said in an interview with CBS host John Dickerson. “This is probably one of the biggest movements as far as people across this country in modern history.