Republican presidential candidate John Kasich is projected to win the Ohio primary, knocking off rival Donald TrumpDonald TrumpTrump's possible science advisor more than just a computer nerd Of biscuits and footballs: The perils of presidents and the nuclear codes Trump's last chance to save our environment MORE to secure a critical victory that increases the likelihood of a contested convention.
Kasich's win gives him all 66 of the state's GOP delegates.
Fox News and CNN called the race at about 8:45 p.m. EDT, just over an hour after polls closed.
Kasich got a late assist on the trail from 2012 GOP presidential nominee Mitt Romney, who campaigned at his side.
And rival Marco RubioMarco RubioGOP senator floats eliminating the corporate income tax The Hill's 12:30 Report Rubio to vote for Tillerson MORE, who had practically no chance iof taking n Ohio, had told supporters in the state to vote for Kasich to try to keep the state's delegates out of Trump's hands.
Trump's loss makes it tougher for the businessman to clinch the nomination outright before the GOP convention. He gains no delegates from Ohio because of the winner-take-all rules.