Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE's campaign chairman said Sunday that the Democratic National Committee's (DNC) leaked emails show the party favored presumptive 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 from the start.

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"What's in those emails show it was clearly a rigged system," Paul Manafort said on ABC's "This Week."

"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 never had a chance, and frankly, I think you're going to see some of that resentment boil over this week [at the Democratic National Convention] in Philly."

Emails from within the DNC leaked by WikiLeaks Friday showed party officials privately planned how to undermine the Vermont senator's presidential campaign.

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

"The establishment and the special interests picked their candidate, Hillary Clinton, and made sure nothing the people were going to do or say were going to interfere with her selection," Manafort said Sunday.