The US Supreme Court will hear arguments Wednesday on whether a wide swath of Donald Trump's tariffs are lawful, in a landmark case that could uphold -- or upend -- the president's economic agenda.

Billions of dollars in customs revenue and a key lever in Trump's trade wars are at stake, while the conservative-dominated court once again grapples with novel tests of presidential authority.

Trump has hyped the case as "one of the most important" in US history and warned of calamity if his tariffs are overturned.

This "case is, literally, LIFE OR DEATH for our Country," he posted Tuesday on his Truth Social platform.

The high court's nine justices will consider Trump's use of emergency powers to impose so-called "reciprocal" tariffs on nearly every US trade partner, as well as levies targ

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