Forces opposing Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE are moving forward with a plan to block him from becoming the GOP presidential nominee by giving delegates a way out of voting for him.

The strategy centers on a rule change for the Republican National Convention that would let delegates vote for any candidate even if they are pledged to support Trump, Politico reported Friday.

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Colorado delegate Kendal Unruh sent the convention rules committee a letter outlining the proposed change.

It would let delegates buck their pledges votes — generally governed by the results of each state's primary or caucus — by invoking a “conscience” clause.

“If any such delegate notifies the secretary of his or her intent to cast a vote of conscience, whether personal or religious, each such delegate shall be unbound and unconstrained by these rules on any given vote, including the first ballot for the selection of the president of the United States, without the risk of challenge, sanction or retribution by the Republican National Committee (RNC),” the letter postmarked Saturday reads.

Unruh’s letter then describes what reasons would justify delegates to vote outside of the candidate they're bound to.

“Allowable personal reasons shall include the public disclosure of one or more any grievous acts of personal conduct by a nominee candidate, including but not limited to, criminally actionable acts, acts of moral turpitude or extreme prejudice, and/or notorious public statements of support for positions that clearly oppose or contradict the policies embodied in the Republican Party’s platform as established at the national convention.”

Politico said Unruh’s letter does not name Trump.

Reports emerged last week Unruh is one of at least 30 delegates hoping to thwart Trump’s expected nomination on the convention floor.

Unruh said on June 17 her campaign lacks an alternative if it keeps Trump from officially becoming the Republican standard-bearer.

“This literally is an ‘Anybody but Trump’ movement,” she told The Washington Post. “Nobody has any idea who is going to step up and be the nominee, but we’re not worried about that. We’re just doing that job to make sure that he’s not the face of our party.”

Unruh is running a group called Free the Delegates aimed at getting a majority of the 112-member rules committee to support her proposal.

Unruh was elected at a state convention to appear as a delegate for Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE, Politico reported. Cruz suspended his White House run early last month after Indiana’s presidential primary.