The U.S. Supreme Court blocked President Donald Trump from using the International Emergency Economic Powers Act to impose his signature "reciprocal" import taxes, invalidating a large portion of his second-term tariff regime. The 6-3 decision found he exceeded his authority by invoking the 1977 emergency law to target trading partners, China, Canada, and Mexico.

With the IEEPA path closed, Trump must rely on other statutes where Congress has delegated limited tariff authority. While the Constitution vests tax power in Congress, decades of legislative compromises have created narrow executive branch pathways. The ruling forces a reset but does not eliminate all options for new import taxes.

Bloomberg Intelligence Senior Policy Analyst Nathan Dean tells Bloomberg Businessweek Daily that businesses now face renewed policy uncertainty. Companies with global supply chains must重新评估 their exposure as the administration explores alternative legal avenues. The immediate market impact centers on sectors like agriculture and manufacturing that bore the brunt of the now-invalidated duties.

Trump's team is reviewing other trade laws, including those addressing unfair practices or national security, to rebuild his tariff wall. The shift demands a different legal justification, potentially altering the scope and timing of future measures. Importers and exporters should prepare for a protracted legal and legislative battle over trade policy tools.