On the do-or-die day of Gov. John Kasich’s presidential campaign, the Ohio governor definitively ruled out joining forces with GOP front-runner Donald Trump.

“There’s no way I would team up with Donald Trump,” said Kasich in an interview with “Fox and Friends.” “No way. Forget it.”

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Kasich, who maintains a “happy warrior” strategy on the campaign trail, has refrained from viciously attacking Trump as the rest of his fellow hopefuls have done. But in the wake of chaotic protests and violent incidents at Trump’s campaign events, Kasich has become more vocal — and desperate.

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“Donald Trump has created a toxic environment,” Kasich said at a news conference on Saturday. “And a toxic environment has allowed his supporters and those who sometimes seek confrontation to come together in violence. There is no place for this. There is no place for a national leader to prey on the fears of people who live in our great country.”

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Trump, who had also taken a gloves-off approach with the governor, is now slamming him on the campaign trail as he tries to solidify a win in Kasich’s home state of Ohio. At a campaign rally leading up to the crucial Ohio primary, the billionaire businessman called Kasich an “absentee governor,” saying Kasich has a lot of problems in Ohio.

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“And your governor, as you know, voted when he was a congressman, voted for [the North American Free Trade Agreement], which is absolutely — Ohio has never come back from that,” said Trump.

What had been a cordial relationship between the two has now become more complicated in the wake of a contentious primary in the winner-take-all state of Ohio. The two, who at one time were thought to have made a strong GOP ticket, have now split, leaving the party in disarray.