By John Kruzel

WASHINGTON (Reuters) -As the U.S. Supreme Court weighs the legality of Donald Trump’s sweeping tariffs, a Democratic-appointed judge’s opinion from an earlier stage in the case could offer the Republican president a roadmap for victory in a major test for one of his core economic policies.

While Trump lost before the U.S. Court of Appeals for the Federal Circuit, his Justice Department lawyers have drawn upon a 67-page dissenting opinion by Judge Richard Taranto, an appointee of Democratic former President Barack Obama, to defend his tariffs before the justices.

The Supreme Court is set during arguments on Wednesday to confront for the first time the question of whether a 1977 law meant for use in national emergencies authorizes a president to impose tariffs, which are ta

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