A container ship sits docked at the Port of Oakland on October 10 in Oakland, California. Justin Sullivan/Getty Images

In just a few days, the Supreme Court will start hearing arguments in what President Donald Trump is calling “one of the most important cases in the history of our country.”

With the bulk of his tariffs — arguably the cornerstone of his entire economic agenda — in jeopardy, he has floated an unprecedented appearance at the nation’s highest court.

The case will consider whether Trump had the legal authority to impose tariffs by citing a law known as the International Emergency Economic Powers Act (IEEPA).

Trump used those powers to push import tax rates as high as 50% on key trading partners including India and Brazil and as high as 145% on China earlier this year.

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