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The U.S. Supreme Court refused to question President Donald Trump’s imposition of more than $4 billion in steel tariffs, turning away an appeal that challenged his use of national security as the legal justification for his trade agenda.

The U.S. Supreme Court has agreed to hear a case in which Springfield, Mo.-based New Prime Inc. seeks to overturn an appeals court ruling that the carrier argued could deprive fleets and owner-operators alike of their right to resolve disputes through arbitration.