Beijing rejects Washington’s transshipment accusations as Mexico signals fresh duties on Chinese steel and textiles, deepening a trade rupture that is redrawing sourcing maps across North America.
MEXICO CITY/BEIJING, August 24, 2026. China’s Ministry of Commerce has publicly rejected a White House report accusing Chinese exporters of routing goods through Mexico and other countries to evade United States tariffs, escalating a war of words that erupted just hours after news emerged that Mexico is preparing to tighten restrictions on Chinese products further, with new duties on Chinese steel and textiles under consideration. The ministry’s rebuttal, delivered Thursday, August 20, and reported by the South China Morning Post on August 21 under the byline of Igor Patrick, marks the sharpest exchange yet in a three-way dispute that now binds together the fate of the USMCA review, Mexico’s industrial policy, and Beijing’s export machine.
MOFCOM spokesman He Yadong said the White House report “ignored facts and distorted reality by treating normal international trade and investment as fraud,” according to the South China Morning Post. He characterized the document as “a typical exercise in unilateralism and protectionism” designed to “suppress and block Chinese products,” and accused Washington of “blaming external factors for its own economic problems.” In his most pointed line, He turned the accusation back on the United States: “The high differentiated tariffs imposed by the United States are the real cause threatening the security of global supply chains.” He demanded an immediate end to what he called “irresponsible accusations.”
The timing was not incidental. Bloomberg reported on August 18 that Mexico is weighing plans to impose further trade restrictions on selected products from China and other countries while raising existing import taxes on others, with steel products and vehicles among the leading candidates. Those deliberations are unfolding as Mexico’s joint review of the USMCA with Washington continues, a process that has put Chinese trade flows through North America at the center of the negotiating table. No formal Mexican decree covering new steel or textile duties had been published as of August 24; the measures remain at the preparation stage, according to the August 18 to 21 reporting. But for importers and exporters watching the region, the direction of travel is unmistakable.
A White House report with a wide range and a caveat
The document that triggered Beijing’s response makes an expansive claim about the scale of tariff circumvention. According to the South China Morning Post’s account, the White House report puts the annual value of alleged transshipment trade at between US$40 billion and US$303 billion, a range so broad that it spans nearly an order of magnitude. The report pairs those figures with model-based illustrations suggesting the practice could be associated with 450,000 American jobs and up to US$150 billion in lost economic output.
The breadth of that range matters for anyone trying to assess the real exposure of legitimate supply chains. As the South China Morning Post noted, the report itself concedes that the shift in US import sourcing since 2018 “does not prove all displaced Chinese trade was illegally diverted.” In other words, the post-2018 migration of US import volumes away from China and toward Mexico, Vietnam, and other markets includes an unknown mix of genuine relocation of production, lawful re-export activity, tariff engineering within the rules, and outright fraud. The report does not, on its own terms, disentangle those categories.
That concession has done little to soften Washington’s posture in practice. The United States has already asked Mexico to match its own tariffs on Chinese steel and aluminum, according to reporting by the Rio Times on July 30, and the USMCA joint review that began in July 2026 includes active debate over stricter rules of origin and mechanisms to curb Chinese tariff circumvention through North America. For Beijing, the transshipment report reads less like an evidentiary exercise and more like the analytical scaffolding for a policy push that would close off its largest indirect route into the US market.
Mexico’s tariff wall: already built, and possibly rising
The context for the current escalation is a Mexican tariff regime that has already transformed the cost calculus for Chinese goods entering the country. On January 1, 2026, Mexico brought into effect tariffs of up to 50 percent on 1,463 tariff lines covering autos, toys, steel, textiles, and plastics from countries with which Mexico has no free trade agreement. The proposal had been submitted to Congress on September 11, 2025. The measures potentially affect US$52 billion in imports, equivalent to 8.6 percent of Mexico’s total import bill.
The structure of the regime is deliberately tiered. Rates range from 7 percent to 50 percent depending on product type: raw materials and basic intermediates face duties of 10 to 15 percent, semi-finished goods and critical components face 20 to 35 percent, and finished high-value-added products face the steepest rates of 35 to 50 percent. The design pushes foreign suppliers toward shipping inputs rather than finished goods, an architecture intended to pull assembly and value creation inside Mexico’s borders. The affected non-FTA suppliers include China, India, South Korea, Thailand, and Indonesia, though China, as the dominant non-FTA source, absorbs the largest share of the impact.
President Claudia Sheinbaum has framed the tariffs as industrial policy rather than geopolitics, saying the measures will help stimulate Mexico’s domestic production and reduce the country’s large trade deficit with China. The scale of that deficit explains the political salience. In 2025, China supplied 19.8 percent of Mexico’s imports, worth US$120.15 billion, while Mexico exported just US$9.03 billion to China. The resulting imbalance of US$111.11 billion in China’s favor has become a fixture of Mexican economic debate and a ready argument for protection.
Steel has been the sharpest edge of the policy. Economy Minister Marcelo Ebrard made permanent the 10 to 35 percent tariffs on 220 steel products from non-FTA countries, a list that covers China, Vietnam, and South Korea. Following a complaint by steelmaker Ternium, Mexico has proposed anti-dumping duties on hot-rolled steel calibrated to individual Chinese producers: US$0.20 per kilogram for Shanghai Meishan Iron, US$0.21 per kilogram for Wuhan Iron, and US$0.22 to US$0.23 per kilogram for other Chinese exporters. At the same time, Mexico is phasing out IMMEX temporary-import permits for steel, closing a channel that had allowed duty-deferred steel to enter the country for processing and re-export.
The Bloomberg report of August 18 indicates the next phase is already in motion. Mexico is considering further restrictions on selected products from China and other countries and higher import taxes on others, with steel products and vehicles among the leading candidates, even as the January measures are still working through supply chains. Reporting between August 18 and 21 also indicated that new duties on Chinese steel and textiles are under consideration. It bears repeating that these are escalation signals rather than enacted measures: no decree has been published, and the final scope, rates, and timing remain undetermined. But the pattern, in which each round of pressure from Washington is followed by preparatory signals from Mexico City, suggests the tariff wall is more likely to rise than to plateau.
Beijing’s counter: investigation, findings, and the threat of countermeasures
China’s institutional response to Mexico’s tariffs predates last week’s rhetorical clash. On September 25, 2025, two weeks after Sheinbaum’s tariff proposal went to the Mexican Congress, MOFCOM initiated a trade and investment barrier investigation into the measures. The findings, announced March 25, 2026, and reported by Mexico Business News, concluded that Mexico’s measures “constitute barriers to commerce and investment” and asserted that Beijing “has the right to adopt countermeasures.”
The investigation quantified the stakes from China’s side of the ledger. The Mexican tariff hikes affect more than US$30 billion in Chinese exports, according to the findings reported by Mexico Business News. The estimated losses fall heavily on two pillars of China’s export economy: about US$9.4 billion for the mechanical and electrical sectors, and about US$9 billion for automotive and auto parts. The automotive figure carries particular weight because Mexico was China’s top vehicle export destination in 2025. A market that had become the single largest outlet for Chinese-built cars is now, from Beijing’s perspective, being walled off tier by tier.
What form Chinese countermeasures might take remains unstated, and five months after the March findings, Beijing has emphasized rhetoric over retaliation. He Yadong’s August 20 remarks were aimed at Washington rather than Mexico City, a choice of target that analysts of the dispute will recognize as deliberate. By framing the underlying problem as American “unilateralism and protectionism,” Beijing casts Mexico’s measures as derivative, the product of US pressure rather than sovereign Mexican policy, and keeps open the possibility of a negotiated accommodation with a trading partner it still supplies at enormous scale.
Stakeholders stake their ground
The dispute now features a full cast of stakeholders with clearly articulated positions.
In Beijing, the Ministry of Commerce has adopted the most combative public posture. He Yadong’s language, from “ignored facts and distorted reality” to the demand for an end to “irresponsible accusations,” as quoted by the South China Morning Post, signals that China intends to contest the transshipment narrative at its foundation rather than negotiate over its particulars. The claim that US tariffs themselves are “the real cause threatening the security of global supply chains” reframes the argument for an audience of third countries weighing whether to align with Washington’s approach.
In Mexico City, the government is balancing two constituencies. Sheinbaum’s public case for the January tariffs rests on domestic production and the bilateral deficit with China, a framing designed for Mexican industry and labor. Ebrard, meanwhile, is managing the American dimension: the Rio Times reported on July 30 that while the United States has asked Mexico to match its tariffs on Chinese steel and aluminum, Ebrard is simultaneously seeking to reduce the 50 percent US steel tariff applied to Mexico toward the roughly 10 percent rate the United Kingdom secured. That linkage captures Mexico’s core bargain: tighter alignment against Chinese imports in exchange for restored access to the US market for Mexican producers.
In Washington, the White House report supplies the analytical basis for demands that Mexico and other partners harden their borders against diverted Chinese goods, with the USMCA review serving as the enforcement venue. The debate within that review over stricter rules of origin and anti-circumvention measures is where the report’s conclusions are most likely to be converted into binding obligations.
Mexican industry has its own voice in the process. Ternium’s anti-dumping complaint on hot-rolled steel produced concrete proposed duties against named Chinese mills, demonstrating that domestic producers are prepared to use trade remedy channels in parallel with the government’s tariff program.
The economic arithmetic of decoupling by proxy
For trade professionals, the numbers now on the table describe a structural reordering rather than a cyclical dispute.
Start with the exposure. Mexico’s January tariffs potentially reach US$52 billion in imports across 1,463 tariff lines. China’s investigation puts the affected Chinese export value at more than US$30 billion, with combined estimated losses approaching US$18.4 billion across mechanical and electrical goods (US$9.4 billion) and automotive products (US$9 billion). Set against China’s US$120.15 billion in 2025 sales to Mexico, the measures place roughly a quarter of the bilateral flow under elevated duties, concentrated in precisely the finished, high-value categories that face the 35 to 50 percent tier.
The tiered structure will shape behavior as much as the headline rates. Because raw materials and basic intermediates face only 10 to 15 percent duties while finished products face up to 50 percent, the regime creates a powerful arbitrage in favor of shipping components to Mexico and finishing them locally. That is partly the point: Sheinbaum’s stated goal of stimulating domestic production depends on exactly this substitution. But the same structure is what feeds Washington’s anxiety. Chinese components assembled in Mexico into USMCA-qualifying goods are the gray zone at the heart of the transshipment debate, which is why the USMCA review’s discussion of stricter rules of origin matters more to long-run trade flows than any single tariff line.
The steel measures illustrate how quickly cost structures can shift. Permanent tariffs of 10 to 35 percent on 220 steel products, proposed anti-dumping duties of US$0.20 to US$0.23 per kilogram on Chinese hot-rolled steel, and the phase-out of IMMEX temporary-import permits for steel together remove most of the pathways by which Chinese steel entered Mexican manufacturing at world prices. Manufacturers in Mexico that built costings around duty-deferred Chinese steel inputs face a repricing across their product lines, and the possible new duties flagged in the August reporting would extend that repricing further.
On the US side, the White House report’s own figures invite caution in both directions. If transshipment truly runs anywhere from US$40 billion to US$303 billion annually, the policy response cannot be calibrated with confidence, and the report’s acknowledgment that displaced Chinese trade is not proven to be illegally diverted means aggressive enforcement will inevitably sweep in compliant supply chains alongside fraudulent ones. The model-based illustrations of 450,000 jobs and up to US$150 billion in lost output will nonetheless anchor the political debate.
What importers, exporters, and supply chain managers should take from this
The practical implications extend well beyond companies that trade directly between China and Mexico.
First, the Mexico route into North America is being repriced and re-scrutinized simultaneously. Businesses that moved sourcing or assembly to Mexico after 2018 to serve the US market should expect their bills of materials to face rising duty costs on Chinese inputs (through Mexico’s tiered tariffs and steel measures) and rising documentation demands on origin (through the USMCA review’s push on rules of origin and circumvention). Content tracing, supplier attestations, and defensible origin determinations are moving from best practice to survival requirements.
Second, the enacted-versus-signaled distinction is now a core planning variable. The January 2026 tariffs, the permanent steel tariffs on 220 products, the proposed hot-rolled anti-dumping duties, and the IMMEX steel phase-out are real and operative or formally proposed. The additional duties on Chinese steel and textiles, and the broader restrictions reported by Bloomberg, are signals without a decree as of August 24. Firms should scenario-plan for both states of the world rather than treating the reported measures as settled law, while recognizing that Mexico’s recent pattern has been to follow signals with action.
Third, the collateral reach is wider than China. Mexico’s non-FTA tariff regime also captures India, South Korea, Thailand, and Indonesia, and the permanent steel tariffs cover Vietnam and South Korea alongside China. Suppliers in those countries, and the importers who buy from them, are absorbing measures designed primarily with China in mind. Sourcing strategies that diversified away from China into other Asian suppliers do not automatically escape Mexico’s tariff wall.
Fourth, Chinese exporters face a narrowing map. With Mexico, their top 2025 vehicle export destination, raising barriers, and with Washington pressing other partners to follow, the value of remaining open markets rises, as does the incentive to localize production inside tariff walls. How Mexico treats Chinese investment in local manufacturing, as distinct from Chinese imports, will be one of the most consequential unanswered questions of the next year.
Fifth, the threat of Chinese countermeasures hangs over the entire structure. Beijing’s March finding that it “has the right to adopt countermeasures” has not yet been exercised, but Mexican exporters, who sold US$9.03 billion to China in 2025, and multinationals with Mexican operations serving the Chinese market should treat that exposure as live.
Outlook: the USMCA review is the fulcrum
The next phase of this dispute will be decided less in Beijing or Mexico City than in the USMCA review that has been underway since July 2026. That process bundles the questions now in play: whether Mexico formalizes the additional duties on Chinese steel and textiles, whether it matches US tariffs on Chinese steel and aluminum as Washington has requested, whether Ebrard succeeds in trading that alignment for a cut in the 50 percent US steel tariff on Mexico toward the UK’s roughly 10 percent rate, and how far the parties go in rewriting rules of origin to squeeze Chinese content out of North American supply chains.
Each of those outcomes carries a Chinese response function. Beijing has so far confined itself to investigation findings and rhetoric, but the March 25 declaration of a right to countermeasures gives it a prepared legal and political basis for retaliation whenever it judges the moment right. The more Mexico’s signaled measures become enacted ones, the greater the pressure on Beijing to demonstrate that the finding was not an empty gesture.
For the global trading system, the deeper significance is the precedent. A White House report with a US$263 billion range between its low and high estimates is being used to press third countries into tariff alignment, and a major emerging economy is constructing a tiered tariff regime explicitly aimed at import substitution. He Yadong calls this a threat to global supply chain security caused by American tariffs; Washington calls it a defense against evasion; Sheinbaum calls it domestic industrial policy. All three descriptions can be simultaneously true, which is precisely what makes the dispute so difficult to resolve.
What is certain is that the era in which Mexico served as a low-friction bridge between Chinese production and American consumption is closing. Whether it closes through negotiated rules of origin, unilateral decrees, or a cycle of countermeasures will determine how expensive the transition becomes, and for whom. Importers and exporters with exposure on any side of this triangle should be stress-testing their supply chains now, before the signals of August become the decrees of autumn.