The three Trump-appointed Supreme Court justices shared apparent interest in legal rationales that could deliver the president a win on his contested tariffs.

The U.S. Supreme Court had an unusual visitor Wednesday, as justices listened to arguments on President Donald Trump’s authority to impose tariffs.

Chief Justice John Roberts told Solicitor General ​D. John Sauer, arguing for the administration, that the tariffs are "the imposition of taxes on Americans, and that has always been the core power o...