President Trump argues he has the authority under a 1977 emergency powers act to impose significant tariffs aimed at addressing trade deficits and drug trafficking from Canada, China, and Mexico. This claim is part of a legal battle with seven businesses and twelve states, which contend he exceeded his powers. The administration claims that challenges to this authority threaten U.S. security and that Congress intended to give the president leeway during emergencies. A ruling in favor of Trump could set a precedent allowing a president to impose tariffs without Congressional approval, raising concerns about executive power.

Source: https://www.supplychaindive.com/news/white-house-asks-supreme-court-to-uphold-trumps-tariff-powers/760705/