In a draft letter with more than 70 signatories that is expected to be formally sent next week, they warn of "the catastrophic impact" they predict Trump's campaign will have on other Republicans who are running this year.
The signatories include five former Republican members of Congress and Republican staffers who previously worked at the RNC, on Capitol Hill and served in several Republican administrations.
Former Sen. Gordon Humphrey from New Hampshire leads the list of elected officials, along with former Rep. Tom Coleman of Missouri, Mickey Edwards of Oklahoma, Chris Shays of Connecticut and Vin Weber of Minnesota. The rest are former GOP staffers and delegates.
In the letter, the signatories write that “Trump’s divisive and dangerous actions are not only a threat to our other candidates, but to our Party and the nation.”
They list Trump's attacks on Gold Star families, his refusal to release his tax returns, his suggestions that "a hostile foreign government" intervene in the election -- referring to Russia -- and his controversial comments about how Second Amendment supporters could stop Hillary Clinton from picking Supreme Court justices as examples of his missteps in the past month.
The letter goes on to call Trump's loss "likely" and to say that "Trump's chances of being elected president are evaporating by the day."