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 has released a new ad that accuses 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 of being too close to big banks.

"There are two Democratic visions for regulating Wall Street. One says it's OK to take millions from big banks and then tell them what to do," Sanders says in the ad , a reference to his rival for the presidential nomination.

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"My plan: break up the big banks, close the tax loopholes, and make them pay their fair share. Then we can expand healthcare to all and provide universal college education.”

The TV spot, which will hit the airwaves in Iowa and New Hampshire, is the first by either campaign to make a blunt contrast between the two candidates. Both campaigns had stuck to ads the focused on the candidates' personal stories or government service.

Sanders has repeatedly looked to chide Clinton for her ties to big banks, alleging that her willingness to accept donations from the industry could prevent her reining in bad behavior. An exchange on the issue made waves during the November presidential debate, where Clinton accused Sanders of making that point to " impugn my integrity ."

While the new Sanders ad only makes a passing reference to Clinton, the campaign statement that corresponds with it makes the target clear.

"Hillary Clinton, another candidate for the Democratic presidential nomination, recently claimed that her proposals were backed by 'everybody,' " the statement reads.

"In a Jan. 5 speech in Sioux City, Iowa, she asserted that 'everybody who’s looked at my proposals says my proposals are tougher, more effective, more comprehensive.' It wasn’t true then, as The Washington Post reported, and it’s not true now."

The campaign cites a Washington Post fact-checker article that claims Clinton "exaggerated" that endorsement. It also released a letter from economic experts who pan Clinton's Wall Street proposal as too moderate.

Sanders and Clinton have repeatedly locked horns as the calendar moves closer to the start of voting. Sanders leads most New Hampshire polls, and Clinton holds a slim lead in Iowa.