Mexico Pushes Back Against Excess Capacity Investigation

Mexico's Ministry of Economy has formally petitioned the USTR to remove Mexico from a Section 301 investigation targeting structural excess capacity in manufacturing, citing synchronized job losses of 213,000 positions across both countries as evidence of integrated, not competitive, production. The request, grounded in USMCA obligations and WTO commitments, carries direct implications for North American supply chains in automotive, plastics, and machinery sectors. A ruling against Mexico could trigger tariffs that raise production costs and accelerate industrial relocation across the region.

Mexico formally requested the Office of the United States Trade Representative to be removed from a Section 301 investigation into structural excess capacity in manufacturing sectors. "There is neither a legal nor a factual basis to include Mexico within the scope of this investigation," Mexico's Ministry of Economy stated in a written communication to the USTR, in response to an investigation opened on March 17, 2026, and published in the Federal Register.

The USTR launched the investigation on March 11, 2026, targeting 16 economies, China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan, and India, to determine whether their acts, policies, and practices constitute unreasonable or discriminatory conduct that burdens or restricts US commerce under Section 301(b) of the Trade Act of 1974.

"The United States will no longer sacrifice its industrial base to other countries that may be exporting their problems with excess capacity and production to us," said US Trade Representative Jamieson Greer at the time of the investigation's announcement. "Across numerous sectors, many US trading partners are producing more goods than they can consume domestically. This overproduction displaces existing US domestic production or prevents investment and expansion in US manufacturing production that otherwise would have been brought online."

Mexico Cites Synchronized Job Losses as Evidence

Mexico's central argument rests on employment data that it says demonstrates the two countries' manufacturing sectors move in lockstep rather than in competition. According to figures from the US Bureau of Labor Statistics and Mexico's INEGI cited in the submission, the United States lost 102,000 manufacturing jobs between February 2025 and February 2026, while Mexico shed 111,347 positions over the same period, a combined loss of more than 213,000 jobs.

The sectors with the steepest declines were those with the deepest cross-border integration. Transportation equipment accounted for 64,636 job losses across both countries; plastics and rubber for 25,062; and machinery for more than 18,000.

"The synchronized drop in employment demonstrates that Mexico does not have a structural overcapacity; if it did, the Mexican manufacturing cycle would decouple from the American one when demand weakened in the United States," argued the Ministry of Economy.

The Ministry also pointed to the automotive sector as the clearest illustration of integrated production, noting that auto parts and components cross the border multiple times before becoming a finished vehicle, governed by USMCA rules of origin and coordinated decisions by private automakers. "In many industries, decisions about what, when, how, and where to produce are made as if Mexico, the United States, and Canada were a single economy," the presentation stated.

Beyond the employment data, Mexico challenged the USTR's definition of "structural excess capacity," which links underutilized industrial capacity to government incentives that distort markets. The Mexican government said that premise is "incompatible" with its economic model, noting that its Constitution prohibits monopolistic practices and mandates adherence to principles of competition, productivity, and fiscal discipline. Mexico also warned that any unilateral measures resulting from the investigation would raise "serious concerns" about US compliance with its obligations under the World Trade Organization and the USMCA.

The government cautioned that keeping Mexico in the investigation risks disrupting North American supply chains, weakening regional cooperation, raising production costs and consumer prices, and accelerating further manufacturing job losses.

What Section 301 Allows

Section 301 of the Trade Act of 1974 is the principal US statutory tool for addressing unfair foreign trade practices. It authorizes the USTR to investigate and respond to foreign government acts, policies, or practices that are unjustifiable, unreasonable, or discriminatory and that burden or restrict U.S. commerce. Remedies can include tariffs, import restrictions, or other trade actions against the country found to be engaging in such practices.

Under Section 302(b) of the Trade Act, the USTR may self-initiate a Section 301 investigation without a petition from a domestic industry, the mechanism used to open the current manufacturing probe. Once an investigation is launched, the USTR is required to seek consultations with each economy under scrutiny and must consider the advice of an inter-agency Section 301 Committee as well as appropriate advisory bodies before taking any retaliatory action.

The tool has historically been used most prominently against China. The Trump administration's first term relied on Section 301 to impose tariffs on hundreds of billions of dollars in Chinese goods, and those measures remain largely in place. The current investigation marks one of the broadest applications of the statute, extending its reach to 16 economies across Asia, Europe, and North America simultaneously, a scope that trade analysts say is without modern precedent.

For Mexico, inclusion in the same investigation as China carries particular significance given the deep economic integration formalized under the USMCA, the successor to NAFTA, which entered into force in 2020. The agreement was designed in part to embed North American manufacturing into a rules-based framework, and Mexico's submission argues that applying Section 301 against a USMCA partner runs contrary to the spirit and obligations of that treaty.

Investigation Timeline

The USTR opened a public comment docket on March 17, 2026, with written submissions and hearing appearance requests due by April 15, 2026. A public hearing connected to the investigation began May 5, 2026. Mexico's formal submission to the USTR falls within that process.

The investigation was self-initiated by the USTR under Section 302(b) of the Trade Act, which authorizes the trade representative to open Section 301 proceedings without a petition from industry. Upon initiation, the USTR is required to seek consultations with each economy under investigation, a step it completed by formally requesting talks with all 16 governments named in the probe.