On November 5, the Supreme Court will hear arguments on President Trump’s sweeping tariff policy imposed under the International Emergency Economic Powers Act (IEEPA). In the run-up, the administration insisted the tariffs are essential to conducting American foreign policy. Yet as my Cato trade colleagues and I argue in our amicus brief in the case, traditional diplomacy—not emergency tariff powers—has long underpinned America’s most significant international achievements. Far from proving an indispensable diplomatic tool, the IEEPA tariffs are actively undermining US foreign policy. The administration’s argument ... (full story)