Debbie Wasserman Schultz, the chair of the Democratic National Committee, was furious when she was criticized by MSNBC host Mika Brzezinski.

Wasserman Schultz called for Brzezinski to "apologize" and told her co-worker Chuck Todd "this must stop." The DNC chair even complained to MSNBC's president.

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In May, Brzezinski held a segment on the program "Morning Joe" in which she condemned Wasserman Schultz's "unfair" treatment of Bernie Sanders in the Democratic primary.

“This has been very poorly handled from the start. It has been unfair, and they haven’t taken him seriously, and it starts, quite frankly, with the person that we just heard speaking," Brzezinski said, referring to Wasserman Schultz.

“She should step down,” Brzezinski added.

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In a May 18 email, Kate Houghton, the director of the DNC chair's office, forwarded a report on Brzezinski's segment to Wasserman Schultz.

"This is the LAST straw," Wasserman Schultz replied, enraged. "This is outrageous. She needs to apologize."

Wasserman Schultz asked DNC Communications Director Luis Miranda to call Phil Griffin, the president of MSNBC.

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Miranda responded noting that Wasserman Schultz "already went to Chuck," a reference to MSNBC's Chuck Todd, moderator of "Meet the Press."

Wasserman Schultz sent another angry message to Todd titled, "Chuck, this must stop." She included the link to the report on Brzezinski's segment and wrote, "I would like to discuss this with you today."

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Todd replied noting he was available to speak with her. She thanked him and said Miranda would schedule a time to talk.

Wasserman Schultz was insistent: "I think we need to speak to both of them," she wrote, referring to Chuck Todd and Phil Griffin, the MSNBC president.

She added, "I've been talking to Phil about this since our breakfast."

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WikiLeaks released approximately 20,000 DNC emails on Friday. Another email shows that Wasserman Schultz called the attempt by the Sanders campaign to moderate the party’s stance on Israel “disturbing.”

The DNC chair has long been criticized for anti-Sanders bias. Wasserman Schultz served as co-chair of Hillary Clinton's 2008 presidential campaign, and is a longtime Clinton ally.