Trump additionally attacked her father, former Vice President Dick Cheney, who also endorsed Harris
Kamala Harris accepts Liz Cheney's endorsement
Vice President Kamala Harris accepts former Representative Liz Cheney's endorsement in the 2024 Presidential Election in Wisconsin, the birthplace of the GOP.
Former President Donald Trump let loose on former Republican Rep. Liz Cheney following her endorsement of Vice President Kamala Harris.
Citing her historic defeat by a 2-to-1 margin in 2022 — and the controversial leadership of her father, Vice President Dick Cheney, during the U.S. invasion of the Middle East — Trump called the former Wyoming Republican a "low IQ war hawk."
"Liz Cheney lost her Congressional Seat by the largest margin in the history of Congress for a sitting Representative. The people of Wyoming are really smart!" Trump wrote on Truth Social.
KAMALA HARRIS TEAMS UP WITH LIZ CHENEY IN BIRTHPLACE OF REPUBLICAN PARTY
Former US President and Republican presidential candidate Donald Trump delivers remarks to the press at Trump Tower in New York City. (ANGELA WEISS/AFP via Getty Images)
He continued, "She is a low IQ War Hawk that, as a member of the J6 Unselect Committee of Political Hacks and Thugs, ILLEGALLY DESTROYED & DELETED all documents, information, and evidence."
Cheney, a one-time rising conservative star in the GOP, in the wake of the Jan. 6, 2021 riot on the U.S. Capitol vowed to do everything she can to prevent Trump from returning to power.
The former representative campaigned for Harris in battleground Wisconsin on Thursday — pushing a message of unity against their mutual enemy's campaign to return to the Oval Office.
The campaign event took place in Ripon, where a one-room schoolhouse was designated a national historic landmark due to its role in holding a series of meetings in 1854 that led to the formation of the Republican Party.
NIKKI HALEY DEFENDS TRUMP SUPPORT AFTER BEING CALLED OUT BY LIZ CHENEY: 'THIS IS ABOUT AMERICA'
Former Congresswoman Liz Cheney, R-Wyo., speaks at a campaign event for Democratic presidential nominee Vice President Kamala Harris at Ripon College in Ripon, Wis. (AP Photo/Mark Schiefelbein)
"I have never voted for a Democrat, but this year I am proudly casting my vote for Vice President Kamala Harris," Cheney told the Wisconsin audience as she formally endorsed the Democrat presidential nominee. "As a conservative, as a patriot, as a mother, as someone who reveres our Constitution, I am honored to join her in this urgent cause."
Cheney, who has been vocal in emphasizing the importance of defending the nation's democratic process and of putting country before party, was one of only two Republicans who served on a special select committee organized by House Democrats that investigated the riot at the Capitol.
Trump's social media remarks lumped together Liz Cheney and her former vice president father — who has also endorsed Harris — writing them off as "two fools" who are "suffering gravely from Trump Derangement Syndrome."
"Her father, Dick, was a leader of our ridiculous journey into the Middle East, where Trillions of Dollars were spent, millions of people were killed - and for what? NOTHING!
Democratic presidential nominee Vice President Kamala Harris, left, arrives to speak at a campaign event with former Congresswoman Liz Cheney, R-Wyo., right, at Ripon College in Ripon, Wis. (AP Photo/Mark Schiefelbein)
"Well, today, these two fools, because the Republican Party no longer wants them, endorsed the most Liberal Senator in the U.S. Senate, further Left than even Pocahontas or Crazy Bernie Sanders - Lyin’ Kamala Harris. What a pathetic couple that is, both suffering gravely from Trump Derangement Syndrome. Good Luck to them both!!!"
Cheney on Thursday warned that "our republic faces a threat unlike any we have faced before: a former president who attempted to stay in power by unraveling the foundations of our republic."
She argued that Trump "can never be trusted with power again" and emphasized that "in this election, putting patriotism ahead of partisanship is not an aspiration, it is our duty."
"What January 6 shows us is there is not an ounce, not an ounce, of compassion in Donald Trump. He is petty. He is vindictive. He is cruel. And Donald Trump is not fit to lead this good and great nation," Cheney said.
Fox News Digital's Paul Steinhauser contributed to this report.
Timothy Nerozzi is a writer for Fox News Digital. You can follow him on Twitter @timothynerozzi and can email him at
