WASHINGTON — The Supreme Court’s conservatives face a test of their own making this week as they decide whether President Donald Trump had the legal authority to impose tariffs on imports from nations across the globe.

At issue are import taxes that are paid by American businesses and consumers.

Small-business owners had sued, including a maker of “learning toys” in Illinois and a New York importer of wines and spirits. They said Trump’s ever-changing tariffs had severely disrupted their businesses, and they won rulings declaring the president had exceeded his authority.

On Wednesday, the justices will hear their first major challenge to Trump’s claims of unilateral executive power. And the outcome is likely to turn on three doctrines that have been championed by the court’s conservativ

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