A former state chairman for Sen. Ted CruzRafael (Ted) Edward CruzConservatives seize on New York Post story to push Section 230 reform Changing suburbs threaten GOP hold on Texas Hillicon Valley: Trump refuses to condemn QAnon | Twitter revises its policy, lets users share disputed article | Google sees foreign cyber threats MORE's (R-Texas) presidential campaign is calling for an "insurrection" at the Republican National Convention this summer to keep Donald TrumpDonald John TrumpPolice say man dangling off Trump Tower Chicago demanding to speak with Trump Fauci says he was 'absolutely not' surprised Trump got coronavirus after Rose Garden event Biden: Trump 'continues to lie to us' about coronavirus MORE from being nominated.

"There's a moral obligation for the delegates in that convention to nominate the best candidate to beat Hillary ClintonHillary Diane Rodham Clinton Rally crowd chants 'lock him up' as Trump calls Biden family 'a criminal enterprise' Undecided voters in Arizona wary of Trump, crave stability Push to expand Supreme Court faces Democratic buzzsaw MORE. It's clearly not Donald Trump," Steve Lonegan, Cruz's New Jersey state chairman, said on CNN's "At This Hour."

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"These delegates have an obligation on day one — I don't care about being bound on the first ballot. Break the rules, unbind yourself. This guy's gonna lose, he's going to take the Republican Party down to cataclysmic defeat," he added.

Lonegan is a spokesman for the Courageous Conservatives PAC.

Lonegan said ever since Cruz dropped out in early May, "I've woken up every morning looking for reasons to support Donald Trump, and it's going in the other direction."

Republicans leaders have broadly started to coalesce around Trump since his last GOP rivals dropped out of the race, though the businessman has sparked condemnation for racially charged remarks in recent days going after the Mexican heritage of a federal judge overseeing lawsuits against Trump University.