The court will now begin drafting its opinion behind closed doors after a nearly three-hour hearing that provided a glimpse into the justices’ thinking.
The justices seem unlikely to split along its 6-3 ideological lines when ruling on Trump’s tariffs.
Three of the court’s conservative members posed penetrating questions to the Trump administration, expressing unease about the expansion of executive power sought by the president.
Justice Amy Coney Barrett wondered early on whether there is “any other place” in the law or “any other time in history” where a phrase key to Trump’s position, “regulate importation,” has been used to confer tariff-imposing authority.
Chief Justice John Roberts noted that the emergency statute at the case’s core has never been used to justify tariffs.
“No one has argued that it does until this particular case,” he said.
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