(CNN) Former Florida Gov. Jeb Bush predicted Monday that Donald Trump's supporters will feel "betrayed" when his campaign promises fail to become reality.
"I think people are really going to feel betrayed," Bush told MSNBC's Nicolle Wallace of his former 2016 rival. "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."
Trump's former rival -- who has said he will not vote for Trump and does not plan to attend the Republican National Convention -- said the presumptive nominee is living in an "alternate universe that he created."
RELATED: Last chance for Never Trump: What to watch for this week in Cleveland
"People are going to be deeply frustrated and the divides will grow in our country," Bush said, in his first public remarks since Trump become the GOP's presumptive nominee.
Bush gave Trump credit in one area: his understanding of the media.
"He's a master at understanding how the media works -- more than anybody I've ever seen in politics," Bush said. "Kudos (to) him for kind of creating the environment and then manipulating the environment."
READ: Jeb Bush breaks his silence, calls for a contested convention
Trump has not shied away from Bush's past criticism, telling supporters at a rally in June that he wasn't afraid of efforts among Republicans -- which he accused Bush of leading -- to deny him the nomination at the convention in Cleveland.
"I love competition like that," Trump said. "I love it."