Jane Sanders denied that her husband, Democratic presidential hopeful Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE, has turned to a more negative campaign against rival Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.

“Bernie has not run a negative campaign. He has run a very positive, issue-oriented campaign,” Sanders said on CNN Thursday.

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Host Wolf Blitzer had asked Sanders about her husband’s attacks on Clinton’s judgment, especially regarding support for the Iraq War.

“That’s an answer in response to the demeaning, really demeaning things that Secretary Clinton and her campaign consistently are saying about him — that he’s not qualified, he hasn’t studied up on the issues, all these different things that they’ve been saying and they’re continuing to say,” Sanders said.

Clinton and Bernie Sanders were caught in a back-and-forth spat recently about qualifications for the presidency — the Clinton campaign has argued that Sanders is becoming increasingly negative toward her, and Sanders has maintained that he has been on the defense.

“She may have the experience to be president of the United States,” the Vermont senator said on “Meet the Press” on April 10. “No one can argue that. But in terms of her judgment, something is clearly lacking.”

The vitriol between the two candidates increased during the Democratic debate in New York last week, in which Sanders hammered Clinton for her high-dollar fundraising and Wall Street speeches.

And while Sanders proudly touts running a positive campaign with no attack ads, his campaign released an ad last week calling out Washington politicians who are paid lavishly for speeches and oppose raising the minimum wage to $15 an hour.

The ad doesn’t mention Clinton by name but features many of the criticisms the Vermont senator launched at her during the debate.