Ambassador Greer convenes G20 trade ministers in Milwaukee this week with an agenda built around forced labor, steel overcapacity and a rewrite of the most favored nation principle, testing whether Washington can turn a tariff program into a multilateral rulebook
MILWAUKEE, Sept. 28, 2026 – Trade ministers from the world’s largest economies arrive in Wisconsin this week for a G20 ministerial that the United States has built around four propositions it wants the group to endorse: that forced labor should be driven out of global supply chains, that the most favored nation principle needs updating, that trade in food should not be weaponized, and that structural excess capacity in industrial production is a shared problem requiring collective response.
United States Trade Representative Jamieson Greer will host the meeting from Sept. 29 through Oct. 1, with the substantive ministerial sessions on Sept. 30 and Oct. 1. It is the centerpiece of the American G20 presidency’s trade track, and it precedes the leaders’ summit that President Trump will host at Trump National Doral in Miami on Dec. 14 and 15, 2026, timed to coincide with the celebration of the nation’s 250th anniversary.
The choice of venue is itself an argument. Rather than Washington, New York or a resort, the administration selected an industrial city in a manufacturing state and built the program around it. Ministers will tour a Rockwell Automation facility and meet production workers and industry leaders, and the closing reception will be held at the Harley-Davidson Museum. The Global Forum on Steel Excess Capacity will convene on Sept. 30 alongside the ministerial sessions. The message the administration intends is that trade policy should be judged by its effect on industrial employment rather than by aggregate efficiency gains.
“President Trump’s tariff program is actively rebalancing global trade, reversing decades of non-market policies,” Greer said in announcing the ministerial, adding that the United States would work toward “fair, reciprocal, and balanced trade” with its G20 partners.
The four agenda items
Each of the four agenda items carries a specific policy history, and none of them is neutral.
Forced labor. This is the item on which the United States has moved furthest unilaterally and where it will press hardest for multilateral alignment. In June 2026, USTR issued findings and proposed action in Section 301 investigations covering 60 economies related to their failure to impose and effectively enforce prohibitions on the importation of goods produced with forced labor. Final action followed in July, imposing new Section 301 tariffs across those economies on a two-tier structure. On Sept. 15, USTR convened more than 50 trading partners for training on imposing and enforcing forced labor import prohibitions, an effort plainly designed to build the enforcement capacity that would make a multilateral commitment operational rather than rhetorical.
Bringing that program into the G20 converts an American enforcement action into a candidate international norm. Countries facing the tariffs have an obvious interest in shaping how any collective standard is defined. Countries with strong existing enforcement regimes, including several European members, have an interest in ensuring that a G20 standard does not dilute their own.
The most favored nation principle. This is the most consequential and most contested item. Most favored nation treatment, the requirement that a World Trade Organization member extend to all members any advantage it grants to one, is the foundational non-discrimination rule of the multilateral trading system. Proposing to update it is proposing to revisit the architecture rather than its furniture.
The American case, as the administration has argued it, is that MFN treatment was designed for an order of broadly market-based economies and does not function as intended when applied to economies where state direction of investment, credit and pricing is pervasive. Critics respond that weakening non-discrimination would convert the system into a network of bilateral bargains in which the largest economies set terms and smaller ones accept them, which is precisely the outcome the rule was written to prevent.
Weaponization of trade in food. Framed as a humanitarian and security concern, this item has broad rhetorical appeal and narrow drafting difficulty. Most members will readily denounce the use of food supply as coercive leverage. The hard question is where legitimate export restrictions end, since many countries have imposed food export controls during domestic shortages and regard that as a sovereign prerogative rather than weaponization.
Structural excess capacity. This item runs through the Global Forum on Steel Excess Capacity, which meets on Sept. 30. Steel overcapacity has been a G20 workstream for a decade with limited results, and the American position has hardened considerably since 2025. The United States has applied Section 232 tariffs on steel, aluminum and copper, and in April 2026 strengthened those actions by applying duties to the full customs value of covered articles rather than to metal content alone, a technical change with substantial cost consequences for importers of derivative products.
The excess capacity discussion is also where the ministerial’s China question surfaces most directly. China is a G20 member, and the overcapacity agenda is understood by all participants to be aimed principally at Chinese industrial policy, even when the drafting is general. That the ministerial convenes days after Washington and Beijing announced a bilateral tariff framework covering $60 billion in trade adds a layer of complexity to the room.
Who is coming and what they want
India’s Commerce and Industry Minister Piyush Goyal is among the ministers attending, and his presence points to one of the meeting’s structural tensions. India has consistently argued that the concerns of developing economies deserve greater weight in global economic decision-making, and the American agenda touches Indian interests directly on all four items: food trade rules bear on India’s public stockholding and export control practices, industrial overcapacity discussions implicate Indian steel policy, forced labor standards raise capacity and compliance questions across South Asian supply chains, and any revision of the MFN principle would affect a country that has relied on it.
European members arrive with their own overcapacity agenda. The European Union has moved aggressively on steel, with the Council and the European Parliament striking a deal in April 2026 to protect the European steel industry from global overcapacity, and subsequent measures reducing import quotas and raising tariffs substantially. On the substance of excess capacity, Brussels and Washington are closer than they have been in years. On the MFN question and on the legitimacy of unilateral tariff action, they are not.
The meeting also convenes against an unusual backdrop for the American presidency itself. South Africa, which held the presidency in 2025, has been disinvited from the 2026 cycle following the disagreement over that year’s Johannesburg summit, which the United States boycotted over the South African presidency’s “Solidarity, Equality, Sustainability” theme. Poland has been extended a special invitation. The administration has also signaled an intention to restrict observer participation from non-G20 countries, a reversal of recent practice in which more than 40 countries attended the Johannesburg summit.
The rationale offered is that the group had grown unwieldy. Treasury Secretary Scott Bessent has summarized the administration’s view in a single line, saying that “the G20 has become the G100.” The counterargument is that narrowing participation reduces the legitimacy of whatever the group produces.
The economic backdrop
The ministers gather at a moment when the tariff landscape has shifted more in two years than in the preceding three decades, and the numbers frame the conversation whether or not they appear in any communiqué.
The Tax Foundation puts the average applied United States tariff rate at 11.8 percent in 2026, up from 1.5 percent in 2022, with new tariff measures affecting roughly 54 percent of American goods imports and more than 50 distinct tariff policy changes implemented since January 2025. The organization estimates tariff collections of approximately $108.5 billion for 2026 on a conventional basis, or about $81.2 billion after accounting for economic responses, and calculates an average tax increase of roughly $820 per American household for the year, down from about $1,000 in 2025 following the Supreme Court decision narrowing tariffs imposed under the International Emergency Economic Powers Act. Its long-run modeling projects a reduction in gross domestic product of about 0.4 percent and the loss of roughly 338,000 full-time equivalent jobs.
Those figures are contested, as all tariff incidence estimates are. The administration points to a different set: a goods trade deficit with China down roughly 40 percent since President Trump took office and projected near $140 billion in 2026, substantial announced manufacturing investment, and tariff revenue that has become a meaningful line in federal receipts.
What is not contested is that the American tariff structure is now the most important single variable in most G20 members’ trade planning. That reality gives the Milwaukee meeting a weight that trade ministerials have not carried in years. Ministers are not arriving to negotiate marginal liberalization. They are arriving to understand where American policy is heading and, where possible, to shape it.
The European steel measures illustrate how partners have already begun to respond in kind. Rather than challenging American Section 232 actions and waiting for adjudication, Brussels moved to erect its own protections, cutting import quotas and raising tariffs sharply. That pattern, in which partners answer American measures with parallel measures rather than with retaliation or litigation, has become the defining feature of the current period. It produces less open conflict than a retaliatory spiral but leaves the global tariff level structurally higher, and it is the outcome the excess capacity agenda item is implicitly trying to organize.
A decade of unfinished business
The Global Forum on Steel Excess Capacity, which meets on Sept. 30 in Milwaukee, was created in the aftermath of the 2015 and 2016 steel price collapse, when a surge of exports from economies with substantial state-supported capacity depressed prices worldwide and triggered a wave of trade remedy cases.
Its record is instructive for anyone estimating what Milwaukee is likely to produce. The forum has generated data collection, reporting commitments and repeated ministerial language on the need to reduce market-distorting subsidies. It has not generated verified capacity reductions at the scale participants originally described as necessary. Capacity has continued to grow, and it has spread geographically as production migrated to economies outside the original focus of the discussion.
That history explains both why the United States has moved to unilateral instruments and why partners are wary of committing to another round of collective language. The American argument is that a decade of forum-based engagement failed and that tariffs succeeded in changing behavior where dialogue did not. The counterargument is that unilateral tariffs relocated the problem rather than solving it, pushing excess capacity into third-country production and transshipment rather than retiring it.
Both arguments will be made in Milwaukee. Neither is likely to be resolved there.
Criticism of the American agenda
The American presidency has pared the broader G20 agenda to three economic priorities: removing regulatory burdens, unlocking affordable energy and secure supply chains, and pioneering new technologies and innovation. Climate change, debt, development, inequality and sustainability have been removed from the agenda.
That narrowing has drawn sustained criticism. Elizabeth Sidiropoulos has warned that the narrow economic focus fails to recognize the skewed structural global financial rules affecting developing nations and risks heightening inequality. James Lindsay has framed the question other members are asking as whether Washington aims to make common cause or to impose American views on others.
Those criticisms bear directly on the trade track. A ministerial communiqué requires consensus, and members that object to the presidency’s broader approach have a straightforward way to register that objection, which is to withhold agreement on trade language. Whether Milwaukee produces a joint statement at all, and how much substantive commitment any statement contains, will be the clearest available measure of how much of the G20 the American agenda has actually carried.
What it means for American businesses
For importers, exporters and manufacturers, the Milwaukee ministerial matters less for what is announced this week than for what it signals about the direction of enforcement over the next eighteen months.
Forced labor compliance is the near-term operational issue. The Section 301 forced labor tariffs already in force across 60 economies have made supply chain mapping a customs compliance requirement rather than a corporate social responsibility exercise. Companies sourcing from any of the covered economies need documented visibility beyond their first-tier suppliers, because the enforcement question is not whether a direct supplier uses forced labor but whether any input in the chain does. The USTR training program for more than 50 trading partners indicates that enforcement capacity abroad is being deliberately expanded, which means detentions and exclusions in partner jurisdictions are likely to increase as well. Importers should expect requests for supply chain documentation to become more detailed and more frequent.
Steel and derivative products remain a moving target. The April 2026 change applying Section 232 duties to the full customs value of covered aluminum, steel and copper articles rather than to metal content changed the arithmetic for importers of derivative goods significantly. Any further expansion of derivative product coverage coming out of the excess capacity workstream would compound that. Manufacturers using imported components with metal content should maintain current bills of material and be prepared to demonstrate content calculations.
MFN reform is a long-horizon strategic risk. Nothing decided in Milwaukee will change duty rates next quarter. But a serious multilateral move away from unconditional non-discrimination would, over years, make market access dependent on bilateral political relationships to a degree that companies with globally distributed supply chains have not had to plan for since the mid-twentieth century. Businesses with long-lived capital investments in export-oriented production should treat this as a scenario worth modeling rather than a debate to ignore.
Agricultural exporters have a narrower interest. The food trade item, if it produces anything durable, could constrain the export restrictions that have disrupted grain and fertilizer markets in recent years. That would be favorable for American agricultural exporters, who are generally on the supply side of those disruptions rather than the restricting side.
What to watch in the documents
Three things in whatever emerges from Milwaukee will tell practitioners more than the press conferences will.
The first is whether a joint communiqué is issued at all, or whether the meeting concludes with a chair’s statement. A chair’s statement is what a presidency issues when consensus is unavailable, and it commits no one but the host. Recent G20 practice has included both, and the choice will be the single clearest indicator of how much of the agenda actually carried.
The second is the drafting on forced labor. The distance between language committing members to “combat” forced labor and language committing them to prohibit the importation of goods produced with forced labor and to enforce that prohibition is the distance between a sentiment and an obligation. Given that the United States has already imposed Section 301 tariffs across 60 economies on exactly this ground, the specificity of the language matters commercially as well as diplomatically.
The third is whether the excess capacity text includes any measurable commitment: a capacity reporting requirement, a subsidy transparency obligation, a timeline. A decade of forum experience suggests it will not, but the absence would confirm that the administration’s case for unilateral instruments has not been answered.
Importers and exporters should also watch for bilateral meetings held at the margins. Trade ministerials routinely produce more consequential bilateral movement in side rooms than in plenary sessions, and with ministers from most major American trading partners in one building, the opportunity for progress on individual country arrangements is substantial. Several partners have outstanding issues with Washington that are more urgent to them than any G20 text, and those conversations will happen in Milwaukee whether or not they appear on the published program.
The larger question
The Milwaukee ministerial poses a question the administration has not previously had to answer in a multilateral setting. The tariff program has been executed largely through unilateral American authorities: Section 232, Section 301, Section 122, Section 338 and, until the Supreme Court narrowed it, the International Emergency Economic Powers Act. Those instruments require no partner’s agreement.
Converting the principles behind that program into G20 commitments requires something different. It requires persuading governments that have absorbed American tariffs, and in several cases retaliated against them, to endorse the analytical framework that justified those tariffs. Forced labor is the item most likely to attract genuine consensus. Food trade may produce agreeable language with limited operational content. Excess capacity has a decade of precedent for producing communiqués and not producing capacity reductions. MFN reform is the item on which the administration is least likely to secure agreement and most likely to reveal how isolated or how persuasive its position actually is.
Ministers will spend two days in a Wisconsin factory town being shown what the administration believes trade policy is ultimately for. Whether that argument travels is what will be worth reading in whatever document emerges on Oct. 1.