Sen. Bernie SandersBernie SandersGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate MORE (I-Vt.) on Sunday said Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonDershowitz: 'Too many politicians are being subject to criminal prosecution' The 13 Republicans needed to pass gun-control legislation Democrats spar over electoral appeal of 'Medicare for All' 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 TrumpDonald John TrumpHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Celebrating 'Hispanic Heritage Month' in the Age of Trump Let's not play Charlie Brown to Iran's Lucy 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 PenceMichael (Mike) Richard PenceFarm manager doubts story horse bit Pence: report Supreme Court comes to Trump's aid on immigration 'Mike Pounce' trends on Twitter after Trump slip at GOP retreat 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.