Twenty-four states are moving to block the president’s latest moves even as Washington opens a sweeping trade inquiry — a clash that puts section 301 tariffs at the center of a legal and political tug-of-war. The probe now names China, the European Union, India, Japan, South Korea, Mexico and a dozen other trading partners as potential targets and could pave the way for new import levies by this summer.
Section 301 Tariffs: Who and what are being investigated?
Verified facts: US Trade Representative Jamieson Greer announced a Section 301 unfair trade practices probe that could lead to new levies on goods from countries found to have engaged in unfair trade practices. The list of countries under investigation includes China, the European Union, India, Japan, South Korea, Mexico, Vietnam, Thailand, Malaysia, Cambodia, Singapore, Indonesia, Bangladesh, Switzerland and Norway. The probe could allow the United States to impose import taxes on goods from any country identified through this process. Greer said he hoped to conclude the investigations before temporary tariffs imposed in late February expire in July.
Additional facts: The Supreme Court recently struck down a key part of President Donald Trump’s tariffs policies. In response to that ruling the president announced a new global tariff set at 10% when it came into effect, with administration statements expressing an intention to raise the levy to 15%. Treasury Secretary Scott Bessent issued a 30-day waiver for India to buy Russian crude as a stop-gap measure. Canada’s minister for US-Canada trade, Dominic LeBlanc, is in Washington for talks related to the USMCA free trade deal. Separately, 24 states are seeking to block the president’s latest tariffs.
What legal and political contradictions are exposed?
Analysis: The administration has framed the probe as a means to prevent other countries from exporting excess industrial capacity to the United States, language used by Jamieson Greer in the announcement. That framing sits uneasily with the Supreme Court’s prior rejection of the earlier tariff authority: the court’s action removed a legal basis for the prior slate of levies, yet the administration has quickly shifted to a new investigative pathway that could reimpose broad tariffs by summer. President Donald Trump publicly criticized the justices, calling them “fools” in response to the ruling, and adjusted tariff levels in public statements that diverged from the rate ultimately implemented.
Analysis: The probe expands potential targets beyond the initial list of countries affected by previous measures, naming a wide and geographically diverse set of partners. The broadness of the list — stretching from the European Union and China to a range of Southeast Asian economies and smaller European states — raises questions about how trade remedies will be calibrated and whether they will be tied to specific, documented unfair practices or applied more generally as protective measures.
What accountability and transparency are required next?
Analysis and call for action: The procedural pivot to a Section 301 investigation creates an evidentiary burden that must be visible to lawmakers and the public. Verified facts in this file show the administration intends to complete investigations before temporary levies expire in July and that 24 states are pursuing legal challenges to the latest tariffs. Those competing pressures — judicial scrutiny from the recent Supreme Court decision, active litigation by states, and an aggressive investigative timetable announced by Jamieson Greer — demand clear public documentation of findings and rationale from the trade representative’s office and other trade agencies.
Verified facts: The administration has signaled diplomatic maneuvers alongside the probe, with top officials meeting Chinese counterparts in Paris and preparatory talks expected for a presidential meeting in Beijing. These diplomatic tracks intersect with trade actions that could affect exporters and supply chains across multiple regions.
Final recommendation (analysis grounded in verified facts): Congress, the Trade Representative, and executive agencies should publish the evidence tying any country to unfair trade practices, explain how proposed levies map to specific findings, and provide a timeline that accounts for ongoing legal challenges. Without that transparency, the rollout of section 301 tariffs risks appearing reactive to a court setback rather than anchored in documented trade violations — a perception with real economic and legal consequences.
