Over 200 former staffers for notable Republican figures, including Presidents George H.W. Bush and George W. Bush, as well as Senators John McCain and Mitt Romney, have signed an open letter endorsing Democrat Kamala Harris for the presidency. The letter emphasizes that a second term for Donald Trump would be 'simply untenable' and detrimental to everyday Americans, urging moderate Republicans and conservative independents to support Harris over Trump and his running mate, Sen. J.D. Vance. While acknowledging ideological differences with Harris and her running mate, Minnesota Gov. Tim Walz, the signatories warn of the dangers posed by Trump's agenda, including Project 2025, which they believe threatens democratic institutions. Some prominent signatories include Reed Galen and Olivia Troye, who have previously backed anti-Trump initiatives. The endorsement reflects a broader discontent within the GOP as many high-profile Republicans have distanced themselves from Trump. In response, a Trump campaign spokesman dismissed the letter, calling it 'hilarious' and questioning the significance of the signers.