Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) on Sunday said Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE should, at the very least, "not be involved" with the Clinton Foundation if she is elected president.

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"I would certainly suggest that, as president of the United States, she should cease all operations, all contact with the Clinton Foundation," Sanders, who challenged Clinton for the Democratic nomination, said on NBC's "Meet the Press."

But Sanders said he doesn't know enough to weigh in on whether the foundation shouldn't exist at all during Clinton's time as president.

"They do a lot of good things with AIDS and so forth," Sanders said.

"I can't, you know, definitively answer that. But I think ... what we have got to do as a nation is have a very serious debate on the enormous crises facing this country. That is where our focus has got to be."

Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE has previously called for the Clinton Foundation to be shut down "immediately."

"What they were doing during Crooked Hillary’s time as Secretary of State was wrong then, and it is wrong now," Trump said in a statement last month.

"It is now clear that the Clinton Foundation is the most corrupt enterprise in political history."

Trump's running mate, Indiana Gov. Mike Pence Michael (Mike) Richard PenceGardner signals support for taking up Supreme Court nominee this year Biden leads Trump by 12 points among Catholic voters: poll GOP brushes back charges of hypocrisy in Supreme Court fight MORE, echoed the GOP nominee's statement.

Several publications, including The Boston Globe, have also called for the foundation to be shut down if Clinton wins the presidency.

The foundation has faced scrutiny recently over its operations during Clinton's time in the Obama administration.