The first of several lawsuits filed against President Donald Trump’s issuance of reciprocal tariffs based on an emergency powers act is set to be heard by a federal appeals court on Thursday.

The U.S. Court of Appeals for the Federal Circuit in Washington will begin hearing oral arguments in V.O.S. Selections v. Trump, the furthest along of several lawsuits challenging Trump’s use of the International Emergency Economic Powers Act to levy tariffs, CNBC reported.

Trump cited IEEPA, a law that addresses “unusual and extraordinary” threats during national emergencies, in issuing tariffs on Canada, Mexico, and China over the fentanyl crisis. More than a half dozen lawsuits challenged Trump’s interpretation, leading to the U.S. Court of International Trade striking down Trump’s tariffs in late May.

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