Republican presidential nominee Donald TrumpDonald TrumpFacebook temporarily bans ads for weapons accessories following Capitol riots Sasse, in fiery op-ed, says QAnon is destroying GOP Section 230 worked after the insurrection, but not before: How to regulate social media MORE's campaign chairman said Sunday that the Democratic National Committee's (DNC) leaked emails show the party favored presumptive presidential nominee Hillary ClintonHillary Diane Rodham ClintonFor Joe Biden, an experienced foreign policy team Millennials and the great reckoning on race Biden chooses Amanda Gorman as youngest known inaugural poet 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 SandersBernie SandersSenate Democrats leery of nixing filibuster 'Almost Heaven, West Virginia' — Joe Manchin and a 50-50 Senate Biden to seek minimum wage in COVID-19 proposal 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. 

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.