The U.S. Supreme Court hears President Donald Trump's bid to preserve his sweeping tariffs pursued under a 1977 law meant for emergencies.

U.S. President Donald Trump’s key tool for deploying tariffs will face a critical legal test in the Supreme Court on Wednesday — one which could upend his plans to realign global trade.

Trump has made tariffs a central piece of his economic and foreign policy, and has said it would be a “disaster” if the Supreme Court rules against him.