• U.S. Trade Representative Jamieson Greer confirms the Trump administration is implementing a 15% global tariff using Section 122 of the Trade Act of 1974, following a Supreme Court ruling that blocked previous tariff authority.
  • The Supreme Court's 6-3 decision on February 20, 2026, invalidated approximately 70% of all tariffs previously imposed globally, estimated at $142 billion in revenue, forcing a strategic pivot.
  • The new tariff structure includes a 150-day time limit, exemptions for USMCA-compliant vehicles and parts, and plans to use alternative legal mechanisms like Section 301 and 232 investigations for future implementation.

A Legal Shift in Tariff Strategy

U.S. Trade Representative Jamieson Greer has confirmed that the Trump administration is actively moving forward with a 15% global tariff rate, leveraging Section 122 of the Trade Act of 1974. This comes after a Supreme Court decision on February 20, 2026, ruled 6-3 that the International Emergency Economic Powers Act (IEEPA) did not grant the president authority to impose tariffs, invalidating around 70% of all tariffs previously imposed globally—estimated to have generated $142 billion in revenue. According to people familiar with the matter, the administration acknowledges the legal framework has shifted, but Greer stated explicitly: "The legal tool to implement it, that might change, but the policy hasn't changed."

Efforts to restructure the tariff approach have hit a snag, but officials are determined to maintain protective barriers. The new 15% tariff operates under different constraints: it can only be imposed for up to 150 days before requiring congressional authorization to extend, and Section 122 allows up to 15% without approval during this initial period. Exemptions include vehicles and parts compliant with the U.S.-Mexico-Canada Agreement (USMCA), as well as goods from countries like the UK, EU, and India that had previously negotiated lower rates. Without a deal to extend beyond the 150-day window, the administration would be forced into alternative legal mechanisms, but Greer indicated plans are already in motion.

Economic Implications and Market Reactions

The tariff change creates mixed effects across trading partners, with China benefiting from a reduction from stacked rates up to 60% under IEEPA to the 10-15% range, providing substantial relief for importers. In contrast, the UK is disadvantaged as previously negotiated 10% rates are effectively eliminated, losing the strategic advantage of trade agreements. UK officials stated they would continue "productive conversations" with the U.S. administration while keeping "nothing off the table" in response, according to sources close to the negotiations. The automotive sector faces continued uncertainty; while some consistency is introduced through the blanket rate, the ongoing use of different legal tools creates long-term supply chain planning challenges.

An ABC News/Washington Post/Ipsos poll conducted before the Supreme Court decision found 64% disapproval of how the president was handling tariffs, highlighting public skepticism. Hundreds of businesses have called for refunds on IEEPA tariffs, though Greer stated refunds will not be issued unless courts order them, with guidance expected from the Court of International Trade. Experts predict that despite the Supreme Court's decision, consumer prices are unlikely to decline, as the administration's multiple tariff tools will maintain protective barriers across different product categories and timeframes. The constant fluctuation in the tariff landscape continues to create uncertainty for supply chain planning and long-term business decision-making, with real-time market data showing slight volatility in trade-sensitive sectors.

Future Implementation and Political Context

Beyond the 150-day window, Greer indicated the administration plans to use alternative legal mechanisms, such as Section 301 investigations targeting trade violations, with ongoing investigations into Brazil and China, and additional investigations expected on "industrial excess capacity" in Asian countries. Section 232 investigations are also being framed as national security threats, citing examples like textiles for personal protective equipment and military uniforms. Greer stated: "We found ways to really reconstruct what we're doing...he gives us very durable tools." This pivot demonstrates determination to maintain tariff policy despite legal setbacks, though with reduced flexibility compared to the IEEPA authority.

The ruling represents a significant constraint on executive power, but the administration's response shows a willingness to adapt. Attempts to reach out for comment from trade analysts were met with mixed responses, with some noting the strategic shift could lead to more predictable, albeit still complex, trade environments. As negotiations continue, the focus remains on how these tools will be deployed in the coming months, with industry-specific elements like filing deadlines and specific financial agreements under scrutiny. For now, the tariff landscape remains in flux, with implications rippling through global markets.