The United States asked China to quickly comply with a World Trade Organization (WTO) ruling that Beijing's tariffs on auto-part imports violated global trade rules. U.S. Trade Representative Susan Schwab said the WTO ruling confirmed that China's treatment of U.S. and other imported auto parts was “inconsistent” with its WTO obligations. China lost an appeal against a WTO ruling that its tariffs on auto-part imports violated global rules, the WTO appeal panel announced Monday. “Today, the WTO Appellate Body confirmed that China's discriminatory taxation of U.S. auto parts is fundamentally at odds with core WTO principles,” Schwab said in a statement. “Especially in light of the current problems faced by the U.S. auto industry, I expect China to comply promptly with its WTO obligations by removing an unlawful and unfair trade barrier that is harming U.S. workers and manufacturers,” Schwab wrote. “Both the United States and China benefit from our trade relationship, but as this dispute makes clear, when China adopts measures that unfairly restrict U.S. exports, we will not hesitate to use all available tools to ensure that China complies with the rules of the international trading system,” Schwab said.