Republican presidential candidates Ted CruzRafael (Ted) Edward CruzFBI investigating alleged assault on Fort Bliss soldier at Afghan refugee camp The Memo: Biden's immigration problems reach crescendo in Del Rio Matthew McConaughey on potential political run: 'I'm measuring it' MORE and John Kasich anounced Sunday they would work together as part of a joint effort to prevent party front-runner Donald TrumpDonald TrumpCheney says a lot of GOP lawmakers have privately encouraged her fight against Trump Republicans criticizing Afghan refugees face risks DeVos says 'principles have been overtaken by personalities' in GOP MORE from winning the Republican presidential nomination.
The Cruz-Kasich joint strategy is intended to keep Trump from winning the 1,237 delegates he needs to clinch the nomination. That would lead to a contested Republican National Convention in Cleveland this July, a scenario in which Cruz and Kasich both think they could end up on top.
As part of the strategy, Kasich will clear a path for Cruz in next week’s Indiana primary, while the Texas senator will back down in two other states.
The two campaigns released statements minutes apart late Sunday night, telegraphing their strategies and calling on their supporters to follow suit.
“Donald Trump doesn’t have the support of a majority of Republicans — not even close, but he currently does have almost half the delegates because he’s benefited from the existing primary system,” Kasich chief strategist John Weaver said in a statement.
“Our goal is to have an open convention in Cleveland, where we are confident a candidate capable of uniting the Party and winning in November will emerge as the nominee.”
Cruz campaign manager Jeff Roe echoed Weaver’s criticism of Trump and laid out his own strategy to pull out of Oregon and New Mexico.
“We would hope that allies of both campaigns would follow our lead,” he said.
Trump's campaign ripped the move by his rivals.
"It is sad that two grown politicians have to collude against one person who has only been a politician for ten months in order to try and stop that person from getting the Republican nomination," Trump said in a statement early Monday.
"Collusion is often illegal in many other industries and yet these two Washington insiders have had to revert to collusion in order to stay alive," he added.
Trump won a huge victory last week in New York's primary and is expected to have another big night Tuesday when Pennsylvania and four East Coast states vote.
Both Kasich and Cruz are mathematically eliminated from securing the nomination on the first ballot, while Trump would have to win about 60 percent of the remaining delegates in order to lock up the required 1,237 delegates.
"Never Trump" groups had been calling on Kasich to stand down in Indiana in order to clear a path for Cruz, but he had not shown signs of backing down until now. His campaign claimed an inside-baseball victory in the state weeks before the primary, arguing it had secured the loyalties of the plurality of delegates, who could defect to Kasich in a contested convention.
Cruz has repeatedly framed a vote for Kasich, who sits hundreds of delegates behind him, as a vote in favor of Trump. And Kasich has regularly shot back by arguing that he is the only candidate that polls show beating Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonDemocrats worry negative images are defining White House Heller won't say if Biden won election Whitmer trailing GOP challenger by 6 points in Michigan governor race: poll MORE in the general election.
One anti-Trump group formed by allies of former House Majority Leader Eric CantorEric Ivan CantorBottom line Virginia GOP candidates for governor gear up for convention Cantor: 'Level of craziness' in Washington has increased 'on both sides' MORE (R-Va.) lauded the move in a statement.
This report was updated on April 25 at 9:17 a.m.