Mexico Bets on the First-Round Precedent to Dodge New Tariffs

President Claudia Sheinbaum will withhold Mexico's response to a proposed 10% US tariff until the Ministry of Economy presents its case at the USTR hearing, receiving Trade Representative Jamieson Greer at the National Palace as the third bilateral USMCA round runs in Mexico City. The levy stems from Section 301 forced-labor investigations covering 60 economies and remains in a 45-day consultation window, with roughly 85% of Mexican exports shielded by treaty origin rules. Exporters outside USMCA compliance, along with steel, aluminum and automotive producers already facing Section 232 duties, carry the exposure.

Mexico will not answer Washington's proposed 10% tariff until it has presented its arguments through the formal channel, President Claudia Sheinbaum said, confirming that she will receive US Trade Representative Jamieson Greer at the National Palace on July 23.

Sheinbaum said the government is waiting on the Ministry of Economy's hearing to lay out the full case for why Mexico should not face additional duties. Talks with US authorities remain open, she added, framing the proposed levies as part of a broader sanctions architecture the Trump administration has assembled around reciprocal tariffs.

Her precedent is the first round. When reciprocal tariffs were introduced, goods covered by the USMCA were exempted and duties fell only on trade moving outside the agreement, an outcome Mexico is working to repeat.

What Is Actually on the Table

The proposal emerged from Section 301 investigations into whether trading partners enforce prohibitions on imports made with forced labor. USTR concluded that 60 economies had failed to legislate or apply such measures, and proposed an additional 10% on Mexico along with 13 other partners, including Canada, the European Union, Argentina and the United Kingdom. The remaining economies face 12.5%. Nothing has taken effect: a 45-day consultation period is running, during which affected governments can file observations.

Greer told CNBC this week that determinations would follow within days, adding that most countries lack legislation on forced-labor goods and that those with such statutes do not enforce them. Mexico appeared at hearings on July 7 alongside Peru, Guatemala and Ecuador to request exclusion, and the Ministry of Economy has argued the rate should be revised through bilateral channels rather than imposed.

The exposure is real but bounded. The Ministry of Economy calculates that roughly 85% of Mexican exports to the US qualify under treaty origin rules and would be shielded, which is exactly why Sheinbaum keeps returning to the precedent of the first round. Autos, steel and aluminum sit outside the investigation, already covered by Section 232 orders reaching 50%. Mexican goods currently generate close to US$23 billion annually in US duties.

Greer Arrives Mid-Negotiation

The timing places two tracks on the same table. Greer is in Mexico City from July 22 to July 24 for the third bilateral round of the USMCA Joint Review, where negotiating teams are working through steel and aluminum and derivative products, automobiles, economic security, labor, agriculture and electronic payment services. A meeting at the National Palace is scheduled on July 23 to review progress.

Greer has been unusually specific about his horizon. Testifying before a Senate committee before flying south, he said he hopes to present options for interim arrangements to Trump, Sheinbaum and Canadian Prime Minister Mark Carney before the end of 2026, one with Canada, one with Mexico. Deeper changes to the treaty's core, particularly rules of origin and labor provisions, would take longer and require consultation with Congress the following year.

That distinction matters for Mexico. USTR has separately pressed for tightening the automotive rules of origin, citing industry estimates that US-origin content in vehicles assembled in Mexico fell from over 60% in 2017 to 35% in 2024. Sheinbaum's stated objective for this round is more modest and more immediate: arrangements that deliver stability over the coming years.

Both governments remain able to extend the treaty by 16 years at any poin, a step Mexico and Canada were prepared to take this month before Washington declined, shifting the agreement into annual reviews through 2036.

Canada as the Cautionary Case

Ottawa's week supplies the argument Mexico is trying to avoid. Trump applied 50% duties to Canadian wine, hockey sticks, cement and other goods, and the measures reach treaty-compliant products, undercutting the assumption that origin compliance functions as a shield. Carney announced a call with Trump and an agreement to accelerate negotiations.

Mexico's own metals exposure is already substantial. US duties of 50% on steel and aluminum, together with charges on vehicles falling short of regional content thresholds, have cut Mexican steel shipments north by more than a third and pushed domestic mill utilization to roughly 55%, while automotive exports slipped in early 2026 with hundreds of thousands of jobs exposed.

Sheinbaum has been working the leader-level channel in parallel, using the World Cup final at MetLife Stadium to raise the review directly with Trump and Carney. The government is also coordinating with the Business Coordinating Council on a unified private-sector position, and Economy Minister Marcelo Ebrard has said the US list of demands has narrowed from 54 points to 14.

Separately, Trump has set a timetable for generic pharmaceuticals: duty-free from Aug. 1 for two years, then 100% for twelve months, then 200%, framed as a deadline for manufacturers to relocate production to US soil.