Volkswagen's brand position in U.S. at risk: AutoNation CEO

(Reuters) - AutoNation Inc, the largest U.S. auto retailer, said the "brand position" of Volkswagen AG in the United States was at risk following the German carmaker's manipulation of emission data. "The Volkswagen issue is another blackeye for the diesel engine overall," AutoNation Chief Executive Mike Jackson said in an interview on CNBC.