The Supreme Court justices heard oral arguments in the case challenging Donald Trump’s legal authority in imposing sweeping global tariffs. The legal question is whether a 1977 law called the International Emergency Economic Powers Act, or IEEPA, which allows the president to regulate imports when there is an emergency, extends to the power to impose global tariffs of unspecified duration and breadth.For more context and news coverage of the most important stories of our day, click here: https://www.nbcnews.com
