evidence: More than 200 staffers for four previous Republican presidential nominees have endorsed Democrat Kamala Harris’ White House bid, cautioning that the notion of a second term for GOP nominee Donald Trump is "simply untenable" and "will hurt real, everyday people." In an open letter, first written about on Monday by USA Today, 238 people who worked for former President George H.W. Bush, former President George W. Bush, former Arizona Sen. John McCain and Utah Sen. Mitt Romney call on their fellow "moderate Republicans and conservative independents" to join them in backing Harris and her running mate, Minnesota Gov. Tim Walz, over Trump and his vice presidential pick, Sen. JD Vance of Ohio. [...] Many of the same signatories also issued a letter in 2020 supporting Biden’s candidacy over Trump.