More than 200 Republicans who previously worked for former President George W. Bush, the late Sen. John McCain, R-Ariz., or Sen. Mitt Romney, R-Utah, penned an open letter Monday endorsing Vice President Kamala Harris for president.

The cohort of Republican officials, which also includes a handful of aides to former President George H.W. Bush, previously sought to rally voters against former President Donald Trump in 2020. In their letter, the GOP officials singled out "moderate Republicans and conservative independents," calling on them to vote for Harris.

"Four years ago, President George W. Bush, the late Sen. John McCain, and then-Gov. Mitt Romney alumni came together to warn fellow Republicans that re-electing President Trump would be a disaster for our nation. In those declarations we stated the plain truth, each predicting that another four years of a Trump presidency would irreparably damage our beloved democracy," stated the letter, published Monday by USA Today.

KEY SENATOR REPORTEDLY BEHIND HARRIS' RISE TO POWER WITHHOLDS HIS ENDORSEMENT FOR PRESIDENT

Sen. John McCain, left, and former Gov. Mitt Romney talk at a campaign rally in 2008.

Sen. John McCain, left, and former Gov. Mitt Romney talk at a campaign rally in 2008. (Photo by Joe Raedle/Getty Images)

"We reunite today, joined by new George H.W. Bush alumni, to reinforce our 2020 statements and, for the first time, jointly declare that we’re voting for Vice President Kamala Harris and Gov. Tim Walz this November," the letter continued. "Of course, we have plenty of honest, ideological disagreements with Vice President Harris and Gov. Walz. That’s to be expected. The alternative, however, is simply untenable."

Monday's big endorsement from GOP officials follows a separate endorsement released late last week from a dozen Republican White House lawyers who served under former President Ronald Reagan, as well as under both Bush administrations. Similar to the Monday endorsement, Republican officials argued that returning to a Trump administration "would threaten democracy and undermine the rule of law in our country."

The Monday letter included nearly 240 signatures. It described Trump's leadership as "chaotic" and implied the former president wants to advance the goals of Project 2025 – a Republican blueprint for a potential GOP administration. Trump, however, has repeatedly sought to distance himself from the presidential transition blueprint, including during his recent visit to the southern border.

"They've been told officially, legally, in every way, that we have nothing to do with Project 25," Trump said, according to NPR. "They know it, but they bring it up anyway. They bring up every single thing that you can bring up. Every one of them was false."

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Meanwhile, the Monday endorsement letter also charges Trump and his running mate, Sen. JD Vance, R-Ohio, with "kowtow[ing]" to dictators, such as Russian President Vladimir Putin, while "turning their backs" on U.S. allies. 

"We can’t let that happen," the officials wrote. 

"We know now, thanks to exit polling and voter data, that it was moderate Republicans and conservative independents in key swing states that ultimately delivered the presidency to Joe Biden," the open letter concluded. "We’re heartfully calling on these friends, colleagues, neighbors, and family members to take a brave stand once more, to vote for leaders that will strive for consensus, not chaos; that will work to unite, not divide; that will make our country and our children proud."

Trump and Harris split

Former President Donald Trump and Vice President Kamala Harris (Getty Images)

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In response to the letter, Trump Campaign Communications Director Steven Cheung said, "It's hilarious because nobody knows who these people are. They would rather see the country burn down than to see President Trump successfully return to the White House to Make America Great Again."