After winning his home state of Ohio, Gov. John Kasich promised to stay in the race until the Republican Convention this summer.
"We are going to go all the way to Cleveland and secure the Republican nomination," Kasich said at his victory speech in a Cleveland suburb.
He now heads to neighboring Pennsylvania, which holds its primary April 26.
Despite Kasich's win in the delegate-rich state, he will have only 129 delegates, making it statistically impossible for him to win the necessary 1237 delegates for the nomination.
What Kasich's win does do, however, is make it more difficult for Trump to also obtain a majority of delegates, increasing the possibility that the Republican Party will not have a nominee heading into that party's convention in July. If no nominee won after all the states voted, the delegates decide the winner.
Even after winning Ohio's 66 delegates, he will still have fewer delegates than Florida Sen. Marco Rubio had when he dropped out Tuesday night after a devastating loss in his home state of Florida.
Kasich campaigned heavily in his home state where he's a popular governor. He won among the highly educated with 60 percent and among those who make more than $100,000 per year, according to exit polls.
He won among those who identify as Democrat, whom made up seven percent of primary voters, with 53 percent. He also beat Trump among independents by six percent.