Core Viewpoint - The U.S. Supreme Court is examining the legality of global tariffs imposed by the Trump administration under the International Emergency Economic Powers Act (IEEPA), raising questions about the boundaries of presidential economic authority [1][2] Group 1: Legal Proceedings - The Supreme Court hearing lasted two and a half hours, focusing on whether Trump overstepped the constitutional taxing authority granted to Congress [1] - Chief Justice John Roberts indicated that tariffs are essentially a tax on Americans, which is a core power of Congress, suggesting that significant economic actions by the president require explicit congressional authorization [1] - Some conservative justices argued that the president has inherent discretion in foreign affairs and national security matters, referencing a precedent from the Nixon era [1] Group 2: Government's Defense - The Trump administration defended the tariffs as a necessary measure to address a long-standing trade deficit, which they claim poses a national security threat [1] - Government lawyers warned that removing the tariffs could lead to aggressive trade retaliation from other nations, undermining U.S. economic and security standing [1] Group 3: Financial Implications - U.S. Customs data indicates that since February, the IEEPA tariffs have generated approximately $89 billion in revenue for the U.S. [2] - The outcome of the case could reshape the boundaries of presidential economic power and impact the global trade landscape [2]