Supporters of Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE are going to feel "betrayed" when the presumptive GOP presidential nominee inevitably fails to live up to his promises, Jeb Bush says.

“That’s the heartbreaking part of this — I think people are really going to feel betrayed,” the former Florida governor said in a preview of an MSNBC interview airing later Monday evening.

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“The tragedy of this, though, is that there isn’t going to be a wall built. And Mexico’s not going to pay for it. And there’s not going to be a ban on Muslims. This is all like an alternative universe that he created. The reality is, that’s not going to happen.”

Bush clashed with Trump during his own failed presidential run and has refused to endorse him. He said Trump’s candidacy will do lasting damage to national unity.

“People are going to be deeply frustrated, and the divides will grow in our country. This extraordinary country, still the greatest country on earth, will continue to stagger instead of soar.”

As he has done in the past, Bush acknowledged Trump’s skill at attracting and shaping media coverage.

“Trump, you know, to his credit was very smart at exploiting these kinds of opportunities,” he said.

“He’s a master at understanding how the media works — more than anybody I’ve seen in politics,” Bush added. "Kudos to him for, you know, kind of creating the environment and then manipulating the environment to his effect.”

Bush suspended his Oval Office bid in February and is skipping next week’s Republican National Convention in Cleveland.

Trump renewed his attacks on Bush during a rally in Florida last month, dismissing the value of his endorsement.

“I don’t think he’s going to endorse me, do you, folks?” Trump asked the crowd, before adding: “Who the hell cares?”