President Donald Trump fired the biggest shot yet in the global trade war by imposing tariffs on $34 billion of Chinese imports, including auto parts, delivering on a promise to political supporters that risks provoking retaliation and harming the world economy. The duties on Chinese goods went forward just after midnight Friday in Washington. Another $16 billion of goods could follow in two weeks, Trump said Thursday aboard Air Force One en route to Montana, before suggesting the final total could eventually reach $550 billion, a figure that exceeds all of China's annual goods exported to the U.S. China, in retaliation, hiked tariffs on $34 billion in American goods, including U.S. light-vehicle imports, to 40 percent from 15 percent beginning Friday. The duties will have a disproportionate impact on major U.S. vehicle exporters such as Daimler AG's Mercedes-Benz, BMW AG, Ford Motor Co. and Tesla Inc. China imports nearly 270,000 U.S.-made light vehicles annually, worth $11 billion. In comparison, the list of cars and light trucks made in China and shipped to the U.S. is small and includes the Buick Envision compact crossover and Volvo's S60 sedan.