The case involves the legality of President Trump’s tariffs imposed throughout the world by executive order. The Constitution provides that only Congress – not the President – has the power to impose tariffs. Congress has enacted laws authorizing the President to impose some tariffs, but only with specific limitations and only after an investigation, a period for public comment, and a report to Congress. The President’s tariffs have not complied with the requirements of these laws. What does it matter whether tariffs originate with Congress, as the Constitution requires, or by executive order from the President?