An American flag is reflected on a window of the US Supreme Court on Wednesday, as justices prepared to hear oral arguments on President Donald Trump's bid to preserve sweeping tariffs. Nathan Howard/Reuters

The Supreme Court appeared deeply concerned Wednesday with President Donald Trump’s reliance on a vague federal law to impose global tariffs, with several members of the court’s conservative wing picking apart the administration’s position in a case that could have sweeping implications for the economy and presidential power.

During more than 2 and a half hours of argument in one of the most important economic cases to reach the high court in years , Chief Justice John Roberts and several of his fellow conservatives pointedly questioned the administration on its contention that

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