Pressure continues to build on Clinton over allegations that special access was giving to foundation donors when she was Secretary of State.
On NBC's "Meet the Press," Clinton's one-time rival was pressed on if that means the foundation should shut down entirely.
Click through images of Bernie Sanders on the campaign trail:
Bernie Sanders on the campaign trail
Bernie Sanders on the campaign trail
PHOENIX, AZ - MARCH 15: Democratic presidential candidate Sen. Bernie Sanders (D-VT) speaks to a crowd gathered at the Phoenix Convention Center during a campaign rally on March 15, 2016 in Phoenix, Arizona. Hillary Clinton won the Democratic primary elections in Florida, North Carolina and Ohio, while Missouri and Illinois remain tight races. (Photo by Ralph Freso/Getty Images)
DES MOINES, IA - JANUARY 26: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to the media after holding a campaign event with United Steelworkers Local 310L, on January 26, 2016 in Des Moines, Iowa. Sanders continues his quest to become the Democratic presidential nominee.. (Photo by Joe Raedle/Getty Images)
TOPSHOT - US Senator and Democratic Presidential Candidate Bernie Sanders speaks during a campaign event at the University of Northern Iowa in Cedar Falls, Iowa, January 24, 2016, ahead of the Iowa Caucus. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, participates in the Democratic presidential candidate debate in Charleston, South Carolina, U.S., on Sunday, Jan. 17, 2016. Hours before Sunday's Democratic debate, the two top Democratic contenders held a warm-up bout of sorts in multiple separate appearances on political talk shows, at a time when the polling gap between the pair has narrowed in early-voting states. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
NEW YORK, NY - JANUARY 05: Democratic presidential candidate Sen. Bernie Sanders (I-VT) shakes hands with supporters after outlining his plan to reform the U.S. financial sector on January 5, 2016 in New York City. Sanders is demanding greater financial oversight and greater government action for banks and individuals that break financial laws. (Photo by Andrew Burton/Getty Images)
LEBANON, NH - NOVEMBER 11: Presidential candidate Bernie Sanders (I-VT) marches in the Veterans Day Parade November 11, 2015 in Lebanon, New Hampshire. Sanders goes into the Democrats second debate this weekend still running strong in the polls.(Photo by Darren McCollester/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks at the Congressional Hispanic Caucus Institute conference in Washington, D.C., U.S., on Wednesday, Oct. 7, 2015. While next Tuesday's first Democratic presidential debate will probably lack the name-calling and sharp jabs of the Republican face-offs, there's still potential for strong disagreements between the party's leading contenders. Photographer: Andrew Harrer/Bloomberg via Getty Images
Democratic Presidential candidate Senator Bernie Sanders speaks about the Workplace Democracy Act on Capitol Hill in Washington, DC on October 6, 2015. AFP PHOTO/JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
US Senator from Vermont and Democratic presidential candidate Bernie Sanders addresses striking low-wage contract workers from the US Capitol and religious leaders at the Lutheran Church of the Reformation in Washington, DC, on September 22, 2015 for an interfaith service ahead of the arrival of Pope Francis for a six-day visit to the US. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
MANCHESTER, NH - SEPTEMBER 19: Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena. (Photo by Scott Eisen/Getty Images)
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Sanders replied, "At the very least, she should not be involved. At the very least."
However, Sanders conceded that he didn't "know enough" to say if the foundation should be shut down during a potential Clinton presidency. He also acknowledged that the group does "a lot of good things with AIDS, and so forth."
Separately, Sanders was asked if third party candidates, like Libertarian Party nominee Gary Johnson, should be able to participate in the presidential debates.
The Vermont senator said if "people reach a certain level" they should be included, but added the current 15% standard is "probably too high" and "probably should be lower."
Finally, the former presidential candidate responded to criticism from some of his own supporters that he didn't do enough to help progressive down-ballot candidates, especially Tim Canova, who lost a primary to unseat Rep. Debbie Wasserman Schultz (D-Fla.) last week. Sanders endorsed Canova, but did nottravel to Florida to campaign for him.
Sanders defended himself, saying, "There are a lot of things happening in this country, things happening in my own state, work that I have got to do. I can't do everything."
He added that his supporters "as I understand it, contributed about $600,000 to Mr. Canova's campaign. That is a very significant contribution."
"The political revolution is about transforming America, is getting millions of people involved in the political process," Sanders said. "That's not going to happen overnight...but I think it is happening."