WASHINGTON — In the biggest legal test yet of President Donald Trump’s economic agenda, several conservative justices on the Supreme Court have signaled skepticism about his power to unilaterally impose sweeping tariffs.

It was a “hot bench” during the arguments Wednesday, with each justice posing multiple questions about the case. A decision could take weeks or months.

The administration is defending the tariffs after lower courts ruled that the emergency law Trump invoked does not give him broad authority to set and change import duties. The Constitution grants that power to Congress.

The case involves February tariffs on imports from Canada, China and Mexico, along with “reciprocal” tariffs on most countries that were announced in April. Democratic-leaning states and small businesses

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