"It is like a nightmare. It is hard for me to talk about and think about it," said Jones of Trump's likely nomination for president by the Republican Party.
Jones has been an outspoken critic of Trump's controversial statements on women, Muslims, Latinos, people with disabilities and others.
McGregor could not be immediately reached for comment.
Ohio sends 66 delegates to the convention. Only McGregor and Jones have said they're unable to attend, said Ohio Republican Party spokeswoman Brittany Warner. The party will work with Ohio Gov. John Kasich, who won the Ohio primary, to select replacement delegates, she said.
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