Chinese automaker BYD has filed a lawsuit against the U.S. government challenging President Donald Trump's bid to use sweeping authority to impose tariffs, and requesting a refund for all levies it paid since last April, court documents show. The lawsuit, the first by a Chinese carmaker over U.S. tariffs, follows similar complaints by thousands of global companies with U.S. operations challenging Trump's use of the International Emergency Economic Powers Act (IEEPA) to impose border taxes.