Core Points - The "Major Questions Doctrine" (MQD) established during the Biden administration is now threatening Trump's global tariff plan [1][2] - The U.S. International Trade Court (CIT) ruled that Trump's tariff policy exceeded authority, estimating a tax impact of $1.4 trillion over the next decade, significantly higher than Biden's $400 billion student loan relief plan [1][5] - The legal basis for Trump's tariffs is the ambiguous International Emergency Economic Powers Act (IEEPA) from 1977, which does not clearly authorize large-scale tariffs [3][5] Group 1 - The MQD was initially used by conservative judges to block significant Biden policies, indicating a precedent for evaluating major economic impacts without explicit congressional authorization [1][2] - The CIT's unanimous decision (3-0) highlighted that Trump's tariffs constitute a major economic policy requiring clear congressional authorization [1][4] - Legal and ideological divisions within the Supreme Court may influence the application of the MQD in this case, with differing views on its relevance to presidential powers [3][4] Group 2 - The upcoming Supreme Court ruling will not only determine the fate of Trump's tariff policy but could also set a precedent for the boundaries of presidential power in the future [5] - If the Court maintains a strict stance requiring congressional authorization for significant economic measures, Trump's tariffs may be overturned, marking a historical limitation on presidential taxing authority [5] - Conversely, if the Court accepts the defense regarding national security and presidential authority, it could expand presidential emergency powers in economic matters, prolonging trade war risks and global economic uncertainty [5]