Sen. Elizabeth WarrenElizabeth Ann WarrenGabbard hits DNC over poll criteria for debates The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch Keystone XL Pipeline gets nod from Nebraska Supreme Court MORE (D-Mass.) on Wednesday ripped President TrumpDonald John TrumpThe Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch To ward off recession, Trump should keep his mouth and smartphone shut Trump: 'Who is our bigger enemy,' Fed chief or Chinese leader? MORE for leading the “most corrupt administration ever.”

Warren went after the Trump administration during an interview with CNN after controversial statements from White House budget chief Mick MulvaneyJohn (Mick) Michael MulvaneyTrump's latest plan to undermine Social Security Trump says he'll decide on foreign aid cuts within a week Dick Cheney to attend fundraiser supporting Trump reelection: report MORE.

"He's so corrupt that he was willing to just lay it all out there in front of everyone," Warren said. “He said, 'I am a government official who pays attention to those who pay me.' If that's not corruption, I don't know what the definition of corruption is."

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Mulvaney, who is also the interim director of the Consumer Financial Protection Bureau, suggested Tuesday  that he gave preferential treatment to lobbyists who had donated to his campaign.

“If you were a lobbyist who never gave us money, I didn't talk to you. If you were a lobbyist who gave us money, I might talk to you,” Mulvaney said at a banker conference in Washington.

“If you came from back home and sat in my lobby, I would talk to you without exception, regardless of the financial contributions.”

Mulvaney is a former GOP congressman from South Carolina.

Warren ripped the suggestion as "pay-to-play."

"That's just another way of saying, 'this joint runs great for those who can hire armies of lobbyists and lawyers and have them make big campaign contributions, but not here for real people,’” Warren said Wednesday.

Warren, who serves on the Senate Banking Committee, has confronted Mulvaney before.

Earlier this month, she told him he was “hurting real people to score cheap political points.”