Team Romney looks at blocking Trump at convention

Mitt Romney told his advisors to look into how to block GOP front-runner Donald TrumpDonald John TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada MORE at the Republican National Convention, CNN reported Thursday.

"It sounds like the plan is to lock the convention," a source close to Romney's inner circle told CNN.

Romney is reportedly looking to prevent Trump from getting the required 1,237 delegates before the convention for the Republican nominee. He also doesn't think rivals Marco RubioMarco Antonio RubioNikki Haley: New York Times ‘knew the facts’ about curtains and still released story March For Our Lives founder leaves group, says he regrets trying to 'embarrass' Rubio Rubio unloads on Turkish chef for 'feasting' Venezuela's Maduro: 'I got pissed' MORE, Ted CruzRafael (Ted) Edward CruzPoll: Cruz leads O'Rourke by 3 in Texas Senate race Julián and Joaquin Castro to campaign with O'Rourke in Texas The Hill's 12:30 Report — Trump rips 'ridiculous' spending bill | FBI dragged into new fight | Latest on Maryland shooting MORE or John Kasich will get the required number of delegates before the convention.

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If Trump is blocked at the convention, he may launch a third party candidacy, Republican insiders believe, according to CNN.
Trump signed a pledge last year vowing to run as a Republican and not as an independent, but has said in the past that's contingent on being treated fairly by the Republican party.

Earlier Thursday, Romney bashed Trump in a speech, calling him a "phony" and a "fraud." He urged the public to vote for the candidate that will prevent Trump from getting delegates in their state.

"If the other candidates can find common ground, I believe we can nominate a person who can win the general election and who will represent the values and policies of conservatism," Romney said.
 
Trump shot back, calling Romney a failed candidate and saying the 2012 GOP nominee begged Trump for his endorsement four years ago. Trump said Romney should not have lost the election, adding that Romney thought about running this year but "chickened out."