WASHINGTON — Bernie Sanders took aim Sunday at foreign donations made to the Clinton Foundation, a rare dig at the personal matters of rival Hillary Clinton.

“Do I have a problem with that? Yeah I do,” Sanders told “State of the Union” on donations to the private charity from the Saudi Arabia and others.

The Vermont senator said he’s concerned “a sitting secretary of State and a foundation run by her husband collects many millions of dollars from foreign governments, governments which are dictatorships.”

“You don’t have a lot of civil liberties or democratic rights in Saudi Arabia. You don’t have a lot of respect there for opposition points of view, for gay rights, for women’s rights.”

Sanders has preferred to stick to debating policy issues – breaking up big banks, ending fracking and reforming campaign finance — and has repeatedly declined to make a campaign issue out of Clinton’s private email server.

Last April as he launched his bid for the White House, he called the Clinton Foundation donations “a serious problem” in an interview with ABC, but he hasn’t made it a campaign issue. Instead, Sanders’ stump speech criticism of Clinton’s cash has centered on her paid speeches to Wall Street and super PAC donations.

But in a Hail Mary fight for the nomination, Sanders is pinning his presidential hopes on the California primary Tuesday and didn’t avoid calling out Clinton on the foreign cash.

“Do you think it creates an appearance of a conflict of interest?” pressed host Jake Tapper.

“Yeah, I do,” Sanders said.

The Clinton Foundation accepted millions of dollars in charitable donations from seven foreign governments while Clinton was Secretary of State, including Algeria, Kuwait, Qatar, Oman, Australia, Norway, and the Dominican Republic, the Washington Post reported. Saudi Arabia gave between $10 and $25 million since the foundation’s creation, though not when Clinton was the nation’s top diplomat.

Donald Trump also donated tens of thousands to the Clinton Foundation.

On the verge of sealing enough delegates for the nomination, Clinton has pivoted away from Sanders and focused squarely on Trump, now the GOP presumptive nominee. She’s branded the mogul as “temperamentally unfit” to be president and for setting up a “scam” of a school, known as Trump University, that “took advantage of vulnerable people.”

Asked whether her latest attacks on Trump University are undermined by donations to her Clinton Foundation, Clinton called it “absurd.”

“I mean, really, this is like an absurd comparison,” she told “State of the Union.” “We have disclosed everything, you can see what we do. We put out reports. You could find millions of people who feel that their lives have been improved because of the work. Contrast that [with] the attorney general of New York has said basically Trump U is basically a fraud.”

New York Attorney General Eric Schneiderman has filed suit against Trump University in 2013 alleging the school misrepresented itself and preyed on students.

“This was just a scam to trick people into thinking they would learn Trump’s personal real estate secrets from his hand-picked experts, while we’ve got both Trump and the president of the university under oath … that he didn’t even meet the experts,” Schneiderman told John Catsimatidis on AM 970 in New York Sunday.

“They weren’t his hand-picked experts. And he didn’t write the curriculum. So they weren’t his secrets. It was really a bait-and-switch scheme. Thousands of people were bilked out of millions of dollars.”