GOP presidential hopefuls need to more forcefully differentiate their party’s views on women and Hispanics from Donald Trump’s, or risk losing those voting blocs to the Democrats in the general election, according to key Republicans.

“People like (Jeb) Bush and (Marco) Rubio and (John) Kasich have to feel a responsibility and an obligation to distance not only themselves, but the party, from Trump and his message,” said Fergus Cullen, former chairman of the New Hampshire Republican Party.

“It pushes Republicans out of the mainstream and out of the center, and makes them unacceptable to women voters, Hispanic voters, the very people who decide elections,” Cullen said. “I’m one of those people who thinks this is not harmless fun, this is not a victimless crime. What Trump is doing, it is harmful to the Republican Party’s brand.”

Trump dug in his heels yesterday on the morning news shows, dismissing the uproar over his comment suggesting Fox News anchor Megyn Kelly was menstruating during the GOP debate last week.

The New York real estate mogul came under fire by Kelly, who grilled him about his history of denigrating comments toward women. Trump later said Kelly treated him unfairly, and had “blood coming out of her eyes, blood coming out of her wherever” in asking the question.

Trump, who has also slammed Mexican illegals as rapists, said yesterday only “a deviant” would interpret his comment as related to menstruation.

“Who would say that?” Trump said on CNN’s “State of the Union.”

“Do you think I’d make a statement like that? Who would make a statement like that? Only a sick person would even think about that,” he said.

“I cherish women,” he added, saying, “I apologize when I’m wrong, but I haven’t been wrong. I said nothing wrong.”

Some Democrats, including Democratic National Committee chairwoman Debbie Wasserman Schultz, have attacked the GOP field for not condemning Trump strongly enough.

Democratic operative Scott Ferson said he expects more of that tactic.

“It’s not just that he’s rogue and he’s a Republican; real Republicans are supporting this guy, and they like what he’s saying, and that’s their problem,” Ferson said. “He is a gift to the Democratic Party.”

Cullen disagreed, saying Trump has burned through any real GOP support.

“This is a guy who is embarrassing people who made the mistake six weeks ago of saying, ‘Hey, I might actually be interested in this guy,’ ” Cullen said.

Some GOP hopefuls fired at Trump yesterday on Fox News, whose Sunday show Trump did not appear on. Carly Fiorina told “Fox News Sunday” that there was “no excuse” for Trump’s remark, while Kentucky Sen. Rand Paul said, “I don’t think we should reward vulgarity. I don’t think vulgarity equates to insight.”