Historians of American trade policy will mark the events of this past weekend as among the most consequential in decades. The Supreme Court issued a landmark ruling striking down President Trump’s use of emergency powers to impose sweeping tariffs — and within 24 hours, Trump had raised those tariffs even higher under a different legal authority. The episode encapsulates the turbulent, precedent-breaking character of the current administration’s approach to trade.
The new 15% tariff was announced via Truth Social, citing Section 122 of the Trade Act of 1974 as legal authority. The provision, which allows tariffs of up to 15% for 150 days, had never been used in the fifty years since its enactment. Trump’s invocation of it represented both a legal pivot and a political statement — a refusal to accept the Supreme Court’s ruling as anything more than a temporary obstacle.
The international dimensions of the story were equally significant. Germany and France responded with a combination of economic concern and democratic principle, with Chancellor Merz calling for a coordinated European response and President Macron defending judicial independence as a hallmark of democracy. The UK found its previously negotiated 10% tariff arrangement superseded, adding to a sense that the rules of engagement in US trade policy have become fundamentally unreliable.
At home, Trump’s attacks on the Supreme Court crossed norms that have generally held across administrations of both parties. Calling justices “unpatriotic,” labeling his own nominees an “embarrassment,” and threatening their access to the State of the Union address represented a direct assault on judicial independence that alarmed legal scholars and constitutional experts across the political spectrum.
The economic data adds a crucial dimension to the political narrative. With $130 billion collected in IEEPA tariffs — 90% of which was borne by American businesses and consumers — and business groups demanding refunds, the real-world costs of Trump’s trade war are becoming impossible to ignore. The new 15% tariff, imposed on a country already straining under the weight of trade uncertainty, raises the stakes further still.
