Conway: Biggest fake news story was that Trump couldn't win election

Donald TrumpDonald John TrumpGillibrand backs federal classification of third gender: report Former Carter pollster, Bannon ally Patrick Caddell dies at 68 Heather Nauert withdraws her name from consideration for UN Ambassador job MORE's campaign manager in an interview aired Sunday downplayed the role of fake news in the election, though Hillary ClintonHillary Diane Rodham ClintonSanders expected to announce exploratory committee next week Bernie Sanders records announcement video ahead of possible 2020 bid Overnight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants MORE's top aide cited its spread as part of the reason for her stunning loss. 

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Clinton campaign manager Robby Mook blamed the "post-factual" nature of the election as a factor in Clinton's loss, specifically mentioning Breitbart News, which was founded by Steve Bannon, the CEO of Trump's campaign. 

"The Russians were propagating fake news through Facebook and other outlets,"  Mook added in a joint interview with Trump campaign manager Kellyanne Conway on CNN. 

"But look, we also had, and this is with all due respect to Kellyanne and her colleagues, look, Steve Bannon ran Breitbart News, which was notorious for peddling stories like this."

Conway hit back, saying: "I think the biggest piece of fake news in the election was that Donald Trump couldn't win."