In what may be a preview of Sunday night’s Democratic primary debate, front-runner Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE was hit on her supposedly cozy relationship with Wall Street.

Her chief primary rival, Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.), said on CBS's "Face the Nation" on Sunday morning that Clinton’s stance on Wall Street – telling big bankers in 2007 to “cut it out” – was insufficient.

“Cut it out. Well, you know what, cutting it out is not good enough,” Sanders said.

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“And what the American people are seeing is a huge bail out for Wall Street while the middle class continues to disappear,” he added.

Sanders's comments come on the same day as a Boston Globe report that said Clinton was “hands-off on Wall Street” during her time in the Senate leading up to the financial crisis.

Earlier on Sunday, Clinton tried to disentangle herself from ties to Wall Street, claiming that she has received a greater percentage of campaign donations from teachers and students than big banks.

“I would say that I have gotten maybe 3 percent of my – less than 3 percent of my contributions this time from anybody associated with financial industry activities,” Clinton said on ABC’s “This Week.”

“I’ve gotten so much more from students and teachers,” she added. “Ninety percent of my contributions come from smaller donors, and 60 percent from women.”

But according to opensecrets.com, Clinton has received 7.2 percent of her total contributions from Wall Street – or about $6 million – compared to $2 million from teachers and students.

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The Karl Rove-led super PAC-Crossroads U.S.A. also on Sunday released an ad in Iowa claiming Wall Street “made Clinton a multimillionaire.”

Clinton said the ad demonstrated Republican “anxiety” about her chances in 2016.

“Well, first let me say, I think it shows how desperate Republicans are to prevent me from becoming the nominee,” she said. “I find that, in a perverse way, an incredibly flattering comment on their anxiety, because they know that not only will I stand up for what the country needs, I will take it to the Republicans.”