WASHINGTON — President Trump’s tariff regime is facing its greatest test yet as the Supreme Court on Wednesday hears arguments on a pair of challenges against his use of emergency power to slap duties on countries around the world.

While Trump has enjoyed a remarkably successful track record so far before the high court during his second term, particularly on the shadow docket, many experts say there is widespread uncertainty over how the Supreme Court will rule on the momentous tariff case.

“It’s very uncertain given the makeup of the court,” Gregory Shaffer, a Georgetown Law professor who co-wrote an amicus briefing backing the lower court rulings against Trump, told The Post.

“It could be 50-50,” he added. “There are some justices, such as Justice [Neil] Gorsuch, who have earlier e

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