The Supreme Court is hearing arguments Wednesday over the legality of President Donald Trump's global tariffs program in a blockbuster case with extraordinary significance for American consumers and businesses, the nation's financial health, global diplomacy, and future presidential power.

President Trump has called it "one of the most important cases in the history of our country."

If the tariffs are invalidated, the U.S. government could owe tens of billions of dollars of refunds to businesses that have paid them. Such an outcome could also eliminate a primary bargaining chip that Trump has used in negotiations with other countries.

A decision upholding the tariffs would cement an expansive new exercise of presidential power and preserve a cornerstone of Trump's agenda that eco

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