The NFL and the Commission on Presidential Debates yesterday rejected both of Trump's assertions.
A spokesman for the NFL said the football league didn't send such a letter to Trump. The independent, nonpartisan commission said that no political party or campaign was consulted when the dates were selected last year.
Late Friday night, Trump posted a tweet: "As usual, Hillary & the Dems are trying to rig the debates so 2 are up against major NFL games. Same as last time w/ Bernie. Unacceptable!"
Asked about Trump's assertion, NFL spokesman Brian McCarthy tweeted on Saturday: "While we'd obviously wish the Debate Commission could find another night, we did not send a letter to Mr Trump."
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Two of the three debates scheduled in September and October will be televised during NFL games. On September 26, the night of the first debate, ESPN will carry the Monday night game featuring the Falcons vs. The Saints. On October 9, the second debate will air opposite the Sunday night game featuring the Giants vs the Packers on NBC.
The Democratic Party was criticized during the primary race for scheduling debates between Clinton and Sen. Bernie Sanders on Saturday nights and holiday weekends, times when viewership is low. The Sanders campaign suggested that was an effort to limit the size of the audience.
Trump told ABC: "You know, Hillary Clinton wants to be against the NFL. She doesn't - maybe like she did with Bernie Sanders, where they were on Saturday nights when nobody's home.