U.S. Sen. Elizabeth Warren is calling the Democratic National Committee’s email scandal an “embarrassment to the nation” after leaks showed the party actively ?favoring Hillary Clinton over Bernie Sanders, and adds she was flummoxed by Clinton bringing the DNC chief who resigned in disgrace into her campaign.

The sharp criticism of her own party and the Clinton campaign is highly unusual for Warren, who has taken on the role of Clinton surrogate — to attack Donald Trump and try to woo Sanders’ progressive voters into the fold.

“What happened over at the Democratic national party should not have happened,” Warren told WCVB (Ch. 5) in an interview aired yesterday. “It is an embarrassment to the party and it is an embarrassment to the nation.”

Asked her thoughts on Clinton tapping disgraced DNC Chairwoman Debbie Wasserman Schultz as honorary chair of her 50-state program to help elect Democrats, Warren replied, “I did not understand that.”

“I think that the right thing was that Debbie Wasserman Schultz resigned, I think that was appropriate,” Warren said. “People have been fired, I think that’s appropriate. … We need somebody to get in there and clean house.”

The comments come as Trump has been hammering Clinton over the DNC issue and her own email scandal, calling her a “dangerous liar.”

Still, Clinton is leading Trump by 7 percent to 8 percent in recent polls. Former N.H. GOP Chairman Fergus Cullen said he senses Clinton is reverting to a “play it safe” strategy and laying low as Trump continues to make controversial remarks.

“It’s not a strategy to ?assume your opponent is ?going to continue killing himself, but in this case it could work,” Cullen said. “She’s got lots of vulnerabilities. Most Americans don’t believe that she’s truthful and honest.”

Clinton will deliver what aides are billing as a ?major economic speech on Thursday in Detroit, which Trump is expected to follow next Monday with his own economic address in the same city.

Trump yesterday took a shot at Baltimore Mayor Stephanie Rawlings-Blake, who replaced Wasserman Schultz to gavel in the Democratic National Convention and last week criticized Trump for skipping the ?National Urban League’s conference in her city.

“I see where Mayor Stephanie Rawlings-Blake of Baltimore is pushing Crooked hard,” Trump tweeted. “Look at the job she has done in Baltimore. She is a joke!”