The Supreme Court on Friday struck down a huge chunk of President Donald Trump’s far-reaching tariff agenda, delivering a major rebuke of the president’s key economic policy. The law that undergirds those import duties “does not authorize the President to impose tariffs,” the majority ruled six to three in the long-awaited decision. The ruling is a massive loss for Trump, who has made tariffs — and his asserted power to impose them on any country at any time, without congressional input — a central feature of his administration’s economic and foreign policies. Chief Justice John Roberts delivered the opinion of the court. Justices Clarence Thomas, Samuel Alito and Brett Kavanaugh dissented. Trump’s legal stance “would represent a transformative expansion of the President’s authority over tariff policy,” the majority concluded. They noted that before Trump, no president had ever used the statute in question “to impose any tariffs, let alone tariffs of this magnitude and scope.” To justify the “extraordinary” tariff powers, Trump must “point to clear congressional authorization,” the court wrote. “He cannot.” The ruling …