"We didn't lie. We didn't understand the question first," he said. George Jepson, the attorney general of Connecticut, which is leading a separate probe involving more than 40 US states, slammed Mueller. "Mr Mueller's comments are disturbing, especially in light of the company's continued lack of cooperation with our investigation, and they underscore the importance of our inquiry as well as the investigations launched by other regulators," Jepson said in a statement Tuesday. "We now learn that the company's newly appointed and most senior leader doesn't believe Volkswagen lied, which is undisputable, and cannot say when it plans to deliver its solution to a problem that is affecting millions of Americans, which is unacceptable." On January 4, the US government sued the carmaker for installing defeat devices on nearly 600,000 of its VW, Audi and Porsche vehicles sold in America between 2009 and 2015. The complaint also alleges VW had lied in its applications for the device to the EPA and CARB.