On Monday President Trump continues his feud with "The Tonight Show" host Jimmy Fallon during a South Carolina rally. Business Insider reports that Fallon expresses regret over the infamous 2016 interview in which Fallon tussled Trump's hair, which caught Trump's ire. Trump calls Fallon a "lost soul" and says that he should be thanking him. Fallon acknowledged the feud during his show Monday night, saying Trump should have "more important things to do.