Amy Dacey, CEO of the DNC, subsequently responded “AMEN,” according to the emails.
During the primary battle, Sanders and his supporters accused both the party and Wasserman Schultz of putting their thumb on the scale for Clinton and these emails may indicate support for those allegations.
Sanders called for Wasserman Schultz to step down, and in an April 24 email she received with an article detailing Sanders talking about the DNC being unfair to his campaign, the chairwoman responded, “Spoken like someone who has never been a member of the Democratic Party and has no understanding of what we do.”
After the Nevada Democratic Convention, where things got out-of-hand over a delegate fight, Wasserman Schultz called Sanders campaign manager Jeff Weaver a “damn liar.” In another instance, she referred to him as an “a--," according to the emails.
The DNC did not respond to requests for comment. The Clinton campaign did not immediately respond to a request for comment.
Sanders campaign manager Jeff Weaver told ABC News he was reviewing the documents.
The leak exploded on social media with Sanders supporters expressing anger and frustration that the emails appeared to suggest the party was colluding with the Clinton campaign and plotting against the senator. Some even called on Sanders to revoke his endorsement of the presumptive Democratic nominee.
Mary Alice Parks, Ryan Struyk, John Kruzel, and Noah Fitzgerel contributed to this report.