(NewsNation) — More than 200 Republican officials are separating from former President Donald Trump and are endorsing Vice President Kamala Harris for the presidency, according to a letter released Monday.

In the letter, first reported by USA Today, the former staff members — who once worked for both Bush presidents, Sen. Mitt Romney and the late Sen. John McCain — warned of and outlined the foreign and domestic dangers of a second Trump term.

“At home, another four years of Donald Trump’s chaotic leadership, this time focused on advancing the dangerous goals of Project 2025, will hurt real, everyday people and weaken our sacred institutions,” the group wrote. 

The signatories range from former volunteers, interns and assistants to one-time high-level officials in the White House and Senate, including Jean Becker, former chief of staff for 24 years to former President George H.W. Bush, and Joe Donoghue, former legislative director for McCain.

“Of course, we have plenty of honest, ideological disagreements with Vice President Harris and Gov. Walz. That’s to be expected,” they wrote. “The alternative, however, is simply untenable.”

The group of former aides joins more than two dozen former Republican governors, members of Congress and Trump administration officials who pledged support for Harris’ presidential campaign.

Why are former aides backing Harris?

The group criticized Trump’s policies and Project 2025, a plan proposed by the Heritage Foundation for a potential second Trump term, which the former president has tried to distance himself from, arguing he disagrees “with some of the things they’re saying.”

In response to the letter, Trump campaign spokesperson Steven Cheung stated, “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.”

This comes after the Harris-Walz campaign on Sunday announced “Republicans for Harris,” a program designed to “further outreach efforts to the millions of Republican voters who continued to reject the chaos, division, and violence of Donald Trump and his Project 2025 agenda,” Newsweek reported.

GOP Representatives endorsing Harris

• Former Illinois Rep. Adam Kinzinger
• Former Washington Rep. Rod Chandler
• Former Missouri Rep. Tom Coleman
• Former Maine Rep. Dave Emery
• Former Maryland Rep. Wayne Gilchrest
• Former Pennslyvania Rep. Jim Greenwood
• Former New York Rep. John LeBoutillier
• Former New York Rep. Susan Molinari
• Former New York Rep. Jack Quinn
• Former Virginia Rep. Denver Riggleman
• Former Rhode Island Rep. Claudine Schneider
• Former Connecticut Rep. Christopher Shays
• Former Vermont Rep. Peter Smith
• Former Texas Rep. Alan Steelman
• Former Michigan Rep. David Trott
• Former Illinois Rep. Joe Walsh

GOP governors endorsing Harris

• Former Illinois Gov. Jim Edgar
• Former Massachusetts Gov. Bill Weld
• Former New Jersey Gov. Christine Todd Whitman
• Former Georgia Lt. Gov. Geoff Duncan

Other notable GOP figures endorsing Harris

• Former U.S. Secretary of Defense Chuck Hagel
• Former U.S. Secretary of Transportation Ray LaHood
• Former Mesa, Arizona, Mayor John Giles
• Former GOP state chair and state Senator Chris Vance of Washington
• Reed Howard of Young Republicans for Harris
• Former Republican National Committee (RNC) delegate Rina Shah
• Former Trump White House official Stephanie Grisham
• Former Trump White House official Olivia Troye

A dozen Republican White House attorneys who worked with former Presidents Ronald Reagan, George H.W. Bush and George W. Bush have endorsed Harris for president, including former federal appeals court Judge Michael Luttig.

“We endorse Kamala Harris and support her election as President because we believe that returning former President Trump to office would threaten American democracy and undermine the rule of law in our country,” the lawyers wrote in a letter first reported by Fox News.