By Andrew Chung and John Kruzel WASHINGTON (Reuters) -The lawyer representing Donald Trump's administration faced tough questions from conservative and liberal U.S. Supreme Court justices on Wednesday over the legality of the Republican president's sweeping tariffs in a case with implications for the global economy that marks a major test of Trump's powers. The justices pressed U.S. Solicitor General D. John Sauer, arguing for the administration, about whether Trump had intruded on the power of Congress in imposing tariffs under a 1977 law meant for national emergencies. They also asked Sauer whether Trump's application of the statute to impose tariffs of unlimited duration was a major action by the executive branch that would require clear congressional authorization. The arguments come i

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