An officer at the Democratic National Committee (DNC) is calling for a staff shake-up in the wake of an email controversy that exploded over the weekend and threatens to derail the party’s national convention as it gets underway Monday in Philadelphia.

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Former Minneapolis Mayor R.T. Rybak, a vice chairman at the DNC, told The Hill on Sunday that those involved in scheming to undermine Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE’s presidential campaign should either resign immediately or be fired.

“The DNC needs to make a clear statement that this was wrong and that any member of the staff involved in criticizing another candidate, especially using DNC offices and equipment, should be fired,” Rybak said. “If any officer played a role in helping another candidate when we’re supposed to be neutral, they should resign. It’s that simple. Make a clear statement. Clean up this mess so we can move on and work together.”

A cache of emails released Friday by WikiLeaks revealed at least two instances of DNC officials openly discussing ways to undermine the Vermont senator's campaign.

Sanders and his top aides hit the Sunday talk show circuit to reiterate their demands that DNC Chairwoman Debbie Wasserman Schultz resign. She announced Sunday, a few hours after the on-air onslaught, that she will step down at the end of the convention.

Rybak on Sunday stopped short of calling on Wasserman Schultz to resign — but he came close. The Sanders camp has long claimed that Wasserman Schultz was in the tank for presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE’s campaign and working to undermine Sanders.

“I’ve been clear that I think she has not been effectively unifying the party, and this makes it harder,” Rybak said. “She should examine her actions and ask whether she’s been fair and if she hasn’t been, or if she becomes an issue, she should get out of the way so that we’re talking about Hillary Clinton and not Debbie Wasserman Schultz.”

According to multiple reports, the chairwoman will see a greatly diminished role at the coming convention. Rep. Marcia Fudge Marcia Louise FudgeThis week: House returns for pre-election sprint House to tackle funding, marijuana in September Honoring John Lewis's voting rights legacy MORE of Ohio will instead preside in Philadelphia.

One email revealed by WikiLeaks showed DNC press secretary Mark Paustenbach writing to communications director Luis Miranda about planting a narrative to the media that Sanders’s “campaign was a mess.”

Another email, from DNC CFO Brad Marshall, outlines a plan to question Sanders’s religion ahead of primaries where he had a lead over Clinton.

In regard to the religion email, Rybak said: “I find it disgusting, and there should be a significant consequence and it should be immediate.”

Rybak has been critical of Wasserman Schultz for months. In October, he and Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE, a vice chairwoman at the DNC until she resigned to endorse Sanders, called for an expansion of the primary debate schedule. The two even authored a joint Facebook post calling the debate schedule a “mistake.”

In December, Rybak warned that party leaders must not alienate Sanders supporters.

“Whether people are going to vote for Bernie Sanders or Hillary Clinton, we’re going to need the collective grass roots of all of those efforts,” he said at the time. “It’s imperative that the DNC communicate the importance of that and deliver on that.”

Updated 5:08 p.m.