The Lincoln Project said that the demise of the old Republican Party was caused by Rep. Liz Cheney's loss in her Wyoming GOP primary race.
The organization said that the nation marks the end of the Republican Party tonight.
The statement said that what remains is an authoritarian nationalist cult dedicated to Donald Trump.
The Lincoln Project said she had "stood up to the lawless, reckless attack on our nation" by Trump.
The group called her a "reality-denying conspiracy theorist who promotes the "Big Lie" and bends a knee to Donald Trump."
Today's GOP hates Liz Cheney because she is a dedicated public servant driven by principle. We are looking forward to seeing her next chapter. More people like her are needed in America.
Hageman and Trump's representatives did not respond to requests for comment. A representative for the GOP has been reached by Insider.
Trump's victory this week was his biggest so far. The former president said that Cheney could disappear into the depths of political oblivion.
The Lincoln Project, a political action committee dedicated to keeping Donald Trump from being re-elected, was founded by George and other Republicans.
In 2021, the organization's leadership warned that Trump was a clear and present danger, and that they had organized demonstrations to push anti- Trump messages. Political strategists Rick Wilson and Reed Galen are on its board of directors.