The Trump boys, as played by Saturday Night Live’s Mikey Day and Alex Moffat, filled in for an absent dad on the show’s cold open tonight. Bypassing the usual cast-stuffed gathering, tonight’s introductory sketch featured just the two Trump sons and Kate McKinnon wearing a vaguely Andy Warhol-ish wig as WikiLeak’s Julian Assange. Watch a couple short clips below. In a faux-TV documentary style, The Mueller Files sketch was built around a reenactment of a 2016 Deep…