Corey Lewandowski, a staffer for Donald Trump’s presidential campaign, was fact-checked by Fox News host Howard Kurtz after he suggested that former Democratic nominee Hillary Clinton never conceded the 2016 race. During a Sunday interview on Fox News, Kurtz noted that President Joe Biden had warned of post-election violence if Trump loses the November vote. “Howard, it’s complete nonsense,” Lewandowski opined. “Look, the bottom line is when Donald Trump won the election in 2016, a number of Democrats refused to even acknowledge his success.” Want more breaking political news? Click for the la…