The U.S. head of Volkswagen has resigned amid the ongoing fallout from the auto giant’s emissions cheating scandal. Michael Horn served as the U.S. chief executive since 2014. This comes about six months after the global head of Volkswagen, Martin Winterkorn, also resigned. The Justice Department has sued German automaker Volkswagen after accusing it of installing devices in its vehicles to skirt U.S. emissions regulations. U.S. regulators say Volkswagen vehicles were emitting up to 40 times more pollution than U.S. standards allow.