WOLFSBURG, GERMANY - SEPTEMBER 22:  In this file photo Volkswagen CEO Martin Winterkorn attends the company's annual press conference on March 13, 2014 in Wolfsburg, Germany. Winterkorn announced on September 22, 2015 that he will not step down following the diesel emissions scandal that Volkswagen has admitted could affect up to 11 million VW cars.    (Photo by Sean Gallup/Getty Images)