Korea faces renewed trade tensions with the United States, as the world’s largest economy signals the possibility of investigating trading partners' "unfair" practices to justify its imposition of additional tariffs on Seoul’s key export items. The move comes as U.S. President Donald Trump seeks alternatives to his "reciprocal tariff policy" following constraints imposed by the country’s Supreme Court. Trump invoked Section 122 of the Trade Act to impose a new global tariff rate of 15 percent, which can remain in effect for up to 150 days but requires congressional authorization to extend past that point. U.S. Trade Representative (USTR) Jamieson Greer said in an interview with ABC on Sunday (local time) that there are other methods of imposing tariffs after those declared under Section 122, including investigating trading partners for violations of trade rights or threats to national security under Section 301 of the Trade Act or Section 232 of the Trade Expansion Act. With Section 232 already providing grounds for Washington's item-specific tariffs on Korean automobile and steel