Trump's campaign chairman Paul Manafort said Kasich is "making a big mistake" by not backing Trump and being a part of convention events inside Quicken Loans Arena.
Manafort made the comments Monday morning on MSNBC's Morning Joe.
Kasich was Trump's last primary challenger and has not endorsed the presumptive nominee.
“He's hurting his state and embarrassing his state, frankly," Manafort said.
He also said "people who are part of the future of the Republican Party are, frankly, going to be here participating in the program.”
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