“Personally, I think Hillary Clinton would be a better president than Donald Trump because I think that Donald Trump is a dangerous person and is someone who would embarrass America,” Stuart Stevens, who advised 2012 nominee Mitt Romney, said Tuesday on Bloomberg’s “With All Due Respect.”

“I have no desire to see Hillary Clinton as president of the United States,” he added. “But if this is the choice — I will not give her my vote, but I can’t support Donald Trump.”

Stevens joins a growing number of Republicans who are speaking out and pledging not to back Trump if he wins the GOP nomination. Rep. Scott Rigell (R-Va.) emailed supporters Tuesday and said he refuses to back someone “so lacking in the judgement, temperament and character needed to be our nation’s commander-in-chief.” Sen. Ben Sasse (R-Neb.) said he will look for a third-party candidate if Trump makes it to the general election.