Ohio Gov. John Kasich said it will be "really difficult" for Donald TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE to win the Buckeye State in November because of his divisiveness. 

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Ohio, a presidential battleground, offers 18 electoral votes, which President Obama narrowly won in 2012 and 2008. 

Both Democrat Hillary ClintonHillary Diane Rodham ClintonMissing piece to the Ukraine puzzle: State Department's overture to Rudy Giuliani On The Money: Trump downplays urgency of China trade talks | Chinese negotiators cut US trip short in new setback | Trump sanctions Iran's national bank | Survey finds Pennsylvania, Wisconsin lost the most factory jobs in past year Meghan McCain, Ana Navarro get heated over whistleblower debate MORE and Trump have campaigned regularly in the state, but Kasich isn't confident Trump can win there. 

"Can Trump win Ohio? He's going to win parts of Ohio where people are really hurting," Kasich said Sunday on CNN's "State of the Union."

"There will be sections he will win because people are angry, frustrated and haven't heard any answers. But I still think it's difficult if you are dividing to be able to win Ohio. I think it's really, really difficult."