Bernie SandersBernard (Bernie) SandersGrassroots America shows the people support Donald Trump Five former Obama ambassadors back Buttigieg Both sides were wrong about Mueller report, and none of it will likely matter for 2020 MORE Sunday called on Democratic National Committee (DNC) Chairwoman Debbie Wasserman Schultz to resign following email leaks from within the party that showed officials tried to undermine his presidential campaign. 

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She "should not be chair of the DNC, and I think these emails reiterate that reason why she should not be chair," the Vermont senator said on ABC's "This Week." 

"I think she should resign, period, and I think we need a new chair that's going to lead us in a new direction." 

Emails leaked by WikiLeaks Friday showed DNC officials privately planned how to undermine Sanders's presidential campaign. 

In one May 21 email, DNC press secretary Mark Paustenbach wrote to communications director Luis Miranda about planting a narrative to the media that Sanders’s “campaign was a mess.”

Sanders said Sunday the emails prove what he's been saying all along: The party favored presumptive presidential nominee Hillary ClintonHillary Diane Rodham ClintonGrassroots America shows the people support Donald Trump Ex-FBI official: 'Links and coordination' with Russia happen everyday Ex-FBI agent: Americans should be 'disgusted' by Russian interference in Mueller report MORE from the start. 

"Well, I think I told you a long time ago that the DNC was not running a fair operation — that they were supporting Secretary Clinton. So what I suggested to be true six months ago turns out, in fact, to be true," Sanders said.

"I'm not shocked by it, but I'm disappointed."