Hillary ClintonHillary Diane Rodham ClintonRepublicans invest nearly 0,000 in red Arizona district Al Franken: Sessions firing McCabe ‘is hypocrisy at its worst’ Papadopoulos encouraged by Trump campaign staffer to make contact with Russians: report MORE came under fire from her Democratic rivals for the presidency at Saturday night’s debate for her close ties to Wall Street, with Vermont Sen. Bernie SandersBernard (Bernie) SandersCynthia Nixon: 'Sometimes a little naiveté is exactly what is needed' George Clooney writes Parkland students: 'You make me proud of my country again' Lesson from special election: Run on Social Security, Medicare and lower drug prices MORE saying that the former secretary of State’s pledge to regulate the industry was “not good enough.”

Debate moderator John Dickerson asked Clinton why people should believe that she’ll regulate a banking industry that has filled her campaign coffers and paid her handsomely for speeches.

Clinton responded that during her service in the Senate she offered legislation to rein in CEO compensation and to give shareholders more control over companies, and argued that she’s been critical of the banking industry in the wake of the housing crisis.

But Sanders shot back.

“Not good enough,” he said, pausing for effect.

“Here’s the story, let’s not be naïve about it,” he continued. “Why over her political career has Wall Street been the major contributor to Hillary Clinton? Maybe they’re dumb and don’t know what they’re going to get. But I don’t think so.”

Minutes before, former Maryland Gov. Martin O’Malley dug at Clinton for defending economist Alan Krueger, a White House adviser who has said that raising the minimum wage too much could result in job losses for low-paid workers.

"We need to stop taking our advice from economists on Wall Street,” O’Malley said to applause.

Clinton defended her record, saying “it’s pretty clear” that Wall Street knows she’ll vigilantly regulate the industry.

“Two billionaire hedge fund managers started a super-PAC and are advertising [against me] in Iowa as we speak, so they clearly think I’ll do what I said I’d do,” Clinton said.