U.S. supply chains would also be hurt as many consumer electronics products depend on the export of American semiconductors, software and other inputs to China for assembly before being imported back to the United States. U.S. allies South Korea, Japan and Taiwan also supply cellphone parts for companies like Apple Inc., including displays, cameras and fingerprint scanners, and would feel the impact. "You end up shooting yourself in the foot, shooting your allies in the foot, and maybe you wound China's big toe," said Chad Bown, a senior fellow at the Peterson Institute for International Economics. ORDERS HAVE ALREADY BEEN PLACED Trump could get a quarter of the way to $100 billion in goods taxed by levying toys, games and sporting goods, categories with little U.S. content that totaled about $25.5 billion from China in 2017. But China made up 81.5 percent of all U.S. imports in this group, meaning that there would be few alternative sources for importers that could blunt the tariff impact on consumers.