On the campaign trail, former Vice President Joe Biden on Tuesday told a union autoworker in Detroit he was “full of sh**” and threatened to fight him. Biden made the threat during a photo-op at Detroit’s first new auto assembly plant to be built in decades. The exchange began when the autoworker accused Biden of actively trying to end the Second Amendment. After cursing at the man, Biden repeatedly told a female aide to “shush!” before touting his ownership of shotguns and saying he supports the Second Amendment. Biden threatened to slap the man in the face and threatened to take him “outside” for a fight. During the exchange, Biden also mistakenly referred to the AR-15 semiautomatic assault rifle as an “AR-14.”