Historical Use of IEPA and the 'Elephant in a Mousehole' Concern

The Justices could end President Trump's sweeping global tariffs, if they find he lacks the power to impose them using a 1977 statute called IEEPA. What does that law say, how has it previously been used, and where's the limiting principle? Plus, what to make of the White House's warnings of economic calamity if it loses?

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