Donald Trump said Wednesday that he thought his Republican primary opponents who vowed to support the Party’s nominee should follow through or be banned from running for public office.

Trump, speaking at a campaign rally in Bangor, Maine, said those who signed the RNC’s pledge should “honor the pledge.”

Trump went on to note that some of his former opponents, such as New Jersey Gov. Chris Christie (R) and Dr. Ben Carson, had endorsed him. But not everyone has given Trump the support he desires.

“But just remember this, they signed a pledge saying they will abide, saying they will back the candidate of the party. And now they sit back,” Trump said. “They broke their word. In my opinion, they should never be allowed to run for public office again. Because what they did is disgraceful.”

Trump himself was reluctant to sign the pledge at the beginning of his campaign and repeatedly wavered on answering whether he would commit to the vow.