WASHINGTON — 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.

In a post on social media, Trump called the hearing “one of the most important in the History of the Country.”

The top U.S. court will hear from states and businesses that argue Trump’s use of a national security statute to hit nearly every nation with tariffs goes beyond the powers of the president.

Trump used the International Emergency Economic Powers Act of 1977, known as IEEPA, for his so-called “Liberation Day” tariffs and fentanyl-related duties on Canada, Mexico and China.

The U.S. Constitution gives power over taxes and tariffs to Congress. Jeffrey Schwab of the Liberty Justice Cen

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