In an open letter obtained by POLITICO, the group, which dubs itself “Romney Alumni for Biden,” says Trump’s rhetoric and actions are antithetical to the Republican Party they believe in.

“What unites us now is a deep conviction that four more years of a Trump presidency will morally bankrupt this country, irreparably damage our democracy, and permanently transform the Republican Party into a toxic personality cult,” the group writes in the letter, published on Romney4Biden.com and released on the day Trump is due to deliver his keynote convention address. “We can’t sit by and allow that to happen.”

The 34 total signatories include finance, operations, policy and events staffers from Romney’s presidential bid.

While Romney is not affiliated with the pro-Biden letter, the Utah Republican makes no secret of his distaste for Trump.