In a landmark decision, the Court of International Trade has ruled that President Trump overstepped his statutory authority when he used the International Emergency Economic Powers Act to enact new tariffs on imports from nearly all U.S. trading partners, vacating each of those duties as unlawful and potentially upending the administration’s trade policy. CIT’s ruling , issued late on May 28, vacates all the tariffs Trump has imposed under IEEPA since returning to office this year, including duties on Canada,...