日美11家企业起诉美国政府，要求返还加征关税

Core Viewpoint - The U.S. Supreme Court is reviewing the constitutionality of the tariffs imposed by the Trump administration, with various companies filing lawsuits to seek refunds for the tariffs paid if the court rules them unconstitutional [2][4][6]. Group 1: Lawsuits Filed - At least nine Japanese companies and two U.S. companies have filed lawsuits in the U.S. International Trade Court in New York, which specializes in trade cases [4]. - Companies such as Costco Wholesale, Sumitomo Chemical, Ricoh, and Toyota Tsusho are among those suing the U.S. government for the return of tariffs imposed during the Trump administration [2]. Group 2: Legal Basis and Implications - The Trump administration imposed tariffs based on the International Emergency Economic Powers Act (IEEPA) without Congressional approval, which has been challenged as exceeding presidential authority [6]. - Lower federal courts have ruled that the imposition of tariffs may exceed presidential powers, leading to a constitutional ruling that could have broad economic and diplomatic implications if the Supreme Court rules against the Trump administration [6]. Group 3: Trends in Litigation - The trend of companies suing the Trump administration is expanding, with small businesses in Washington D.C. also filing collective lawsuits against the tariffs [6].