Korea would seek an "optimal" response while watching other countries' moves, should the U.S. Supreme Court rule against President Donald Trump's broad country-specific tariffs, a senior Seoul official said Wednesday, stressing the Asian country is preparing for "all possibilities." Trade Minister Yeo Han-koo made the remarks in a meeting with reporters in Washington as the high court has been deliberating on the legality of Trump's use of the 1977 International Emergency Economic Powers Act (IEEPA) to impose "reciprocal" tariffs on most trading partners, including Korea, the European Union and Japan. Yeo had planned to head back to Korea on the day but delayed his flight to examine potential ramifications from a proclamation that Trump signed on Wednesday to levy a 25 percent tariff on certain semiconductors for artificial intelligence (AI). "While watching how other countries with (trade) agreements with the U.S. would respond, (Korea) would need to explore an optimal judgment depending on how the situation would play out," Yeo told reporters, addressing a question over how Seoul woul