U.S. vehicle safety regulators' tougher posture toward automakers is a "new phase" in the government's relations with the industry and will likely mean higher costs, Fiat Chrysler Automobiles NV Chief Executive Sergio Marchionne said Tuesday. "We're beginning to live through a new phase of regulation in the United States," Marchionne told reporters after the head of the U.S. National Highway Traffic Safety Administration criticized Fiat Chrysler's ( NHTSA chief Mark Rosekind on Monday said the agency was reviewing Fiat Chrysler's handling of 20 recalls and criticized the automaker for failing to act aggressively enough to repair 10 million vehicles covered by the actions.