When the Supreme Court hears arguments next week on President Donald Trump’s tariffs, prepare for crossed wires. Liberals who typically oppose Trump’s economic policies will espouse traditionally conservative legal principles. Conservatives who prioritize doctrine over Trumpism will agree with those liberals, forming an unlikely alliance. And those who reflexively support anything Trump does, for the pure Trump of it all, will twist themselves into pretzels to justify the president’s unbounded executive-power grab. In the end, the Court is likely (though not certain) to strike down Trump’s tariff plan as presently constituted.

The legal battle began in the Court of International Trade, a federal court that handles disputes over international commerce. In May, a panel of three judges — ap

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