WASHINGTON If the Supreme Court undoes U.S. President Donald Trump's sweeping global tariffs, his administration would begin replacing them immediately, U.S. Trade Representative Jamieson Greer told a media outlet. Greer made the remarks in an interview with The New York Times on Thursday, as the high court could rule as early as this week on the legality of Trump's use of the 1977 International Emergency Economic Powers Act (IEEPA) to impose country-specific "reciprocal" tariffs on South Korea and other trading partners. Following any court loss, the Trump administration would "start the next day" to reconstitute tariffs "to respond to the problems the president has identified," Greer was quoted by the daily as saying. Greer also said that he and other advisers had given Trump "a lot of different options" to achieve Trump's trade objectives at the beginning of the second Trump administration -- remarks suggesting that the president might resort to other legal means to impose the global tariffs should the court strike down IEEPA-based tariffs. Business leaders, policymakers and others ha