The three remaining Republican presidential candidates rowed back on promises to support the eventual GOP presidential nominee March 29. (Deirdra O'Regan/The Washington Post)

JANESVILLE, Wis. — None of the three remaining Republican presidential candidates would guarantee Tuesday night that they would support the eventual GOP nominee for president, departing from previous vows to do so and injecting new turmoil into an already tumultuous contest.

Mogul Donald Trump, Texas Sen. Ted Cruz and Ohio Gov. John Kasich were each given a chance during a CNN town hall in Milwaukee to definitively state they would support the nominee. All three declined to renew their pledge. As recently as March 3, in a Fox News debate, all three said they would support the nominee.

“No, I don’t anymore,” Trump told CNN’s Anderson Cooper, when asked if he remains committed to the Republican National Committee pledge he previously signed. Trump said that he would instead wait to see who emerges as the nominee before promising his support.

The GOP presidential candidates talked about the charges against Donald Trump's campaign manager, Muslims in the U.S. and more, and backed away from past pledges to support whomever becomes the nominee during the CNN town hall on March 29. (Jenny Starrs/The Washington Post)

“I have been treated very unfairly,” Trump added.

Trump and his team have braced for the possibility of a contested convention in recent weeks, as opposing forces have set their sights on denying him the nomination by preventing him from crossing the necessary delegate threshold.

Trump said that he believes establishment Republicans and the RNC in particular have not treated him with respect.

“I’m the front-runner by a lot. I’m beating Ted Cruz by millions of votes,” he said. “This was not going to happen with the Republican Party. People who have never voted before, Democrats and independents are pouring in and voting for me.”

Cruz was asked three times by Cooper whether he would support the nominee. Each time, he declined to pledge to support the nominee no matter what.

"I'm not in the habit of supporting someone who attacks my wife and attacks my family," Cruz said, referring to Trump.

When Cooper followed up, Cruz replied: "Let me tell you my solution to that: Donald is not going to be the GOP nominee."

Cooper pressed him a third time. Cruz responded: "I gave you my answer."

Kasich said he would have to "see what happens" in the race before he could answer the question.

Trump pointed to strategic maneuvering in Louisiana that could result in Cruz capturing more delegates from the state despite the fact that Trump won the statewide vote.

“I call it bad politics. When somebody goes in and wins the election and goes in and gets less delegates than the guy that lost, I don’t think that’s right," he said.

On the question of supporting the ultimate party nominee, “I’ll see who it is,” Trump said. "I’m not looking to hurt anybody. I love the Republican Party."

Sullivan reported from Waukesha, Wis.