Washington opens new trade investigations as the world watches the return of tougher U.S. tariff policy
The U.S. administration opened a new round of trade investigations on March 11, 2026, which in the coming months could become the basis for new tariffs against a number of major trading partners of the United States. This is a procedure led by the Office of the United States Trade Representative, known as the USTR, and it was launched on the basis of Section 301 of the U.S. Trade Act of 1974. This legal basis allows Washington to investigate whether the U.S. side considers that certain foreign policies, subsidies or production models unjustifiably harm U.S. trade. For global markets, this is an important signal that U.S. trade policy is once again moving toward a more aggressive and longer-lasting use of tariffs, but this time through a slower and formally more stable legal mechanism.
The new investigations concern what Washington describes as structural excess capacity and production in manufacturing sectors. The U.S. administration claims that some economies produce more goods than their domestic markets can absorb and that this surplus, supported by subsidies and other state incentives, spills over onto the world market and puts pressure on U.S. industry. The list of covered economies is exceptionally broad: China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, South Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan and India. The breadth of that list itself shows that Washington is not viewing this issue as a dispute with a single country, but as an attempt to reshape the broader trade environment.
Why this move matters right now
The timing is not accidental. The new investigation comes less than a month after the U.S. Supreme Court struck down a large part of Trump’s earlier tariff policy adopted by invoking extraordinary presidential powers. The White House then made it clear that it was not abandoning the policy of higher import duties, but that it would resort to other legal instruments. In that context, on February 20, 2026, a temporary import surcharge of 10 percent was already maintained through another legal basis, Section 122, with the announcement that it could also be increased. However, Section 122 has a time limit and does not offer the same durability as proceedings under Section 301, which can result in measures that remain in force for years.
In other words, Washington is now seeking a legally stronger bridge between short-term tariff measures and a longer-term trade strategy. That is why investors, exporters, importers and logistics companies are following this issue with particular attention. If the investigations conclude that certain foreign practices are indeed unjustified or discriminatory toward U.S. trade, the White House could gain the basis for introducing new tariffs that would last significantly longer than the temporary measures adopted immediately after the court decision.
What exactly Washington is investigating
The USTR has officially stated that the investigations will examine whether the policies and practices of the covered economies are unreasonable or discriminatory and whether they burden or restrict U.S. trade. In the background there are several possible elements. In recent weeks, U.S. officials have publicly pointed to subsidies, excessive expansion of production that is not linked to actual demand, suppression of workers’ wages, the maintenance of artificially low export costs, and other forms of state support which, according to the U.S. interpretation, create unfair competition.
It is particularly important that Washington is not limiting the problem to just one sector. Although international discussions about excess capacity have for years focused most heavily on steel, aluminum, shipbuilding and certain parts of the chemical industry, the current U.S. approach is formulated broadly enough to capture different production chains. This means that business uncertainty does not remain confined only to traditional industries, but may spill over into electronics, automotive parts, machinery equipment, textiles, consumer goods and a range of other categories, depending on the outcome of the procedure.
The timetable of the procedure and what follows
The formal calendar is already known. The USTR announced that the comment registry opens on March 17, 2026, that interested parties may submit written comments and applications to participate in the hearing by April 15, 2026, and that public hearings begin on May 5, 2026. This means that the next several weeks will be a period of intense lobbying by industry, chambers of commerce, manufacturers, importers and foreign governments. In such procedures, the battle is often fought not only over whether measures will be introduced, but also over which products, to what extent and with what exemptions.
For companies, at this stage the most important thing is to assess exposure. U.S. companies that depend on imported components want to avoid another jump in costs, while domestic manufacturers that feel exposed to cheaper foreign competition see an opportunity for additional protection. Foreign governments, on the other hand, will try to prove that their industrial policies do not constitute discrimination or that the U.S. problem cannot be reduced to someone else’s production. In practice, this often means a long process of negotiations, pressure and possible partial agreements before a final decision.
Global background: excess capacity is no longer just an American political slogan
Although Washington uses this issue in a distinctly political and protectionist register, the problem of excess capacity is not invented. The Organisation for Economic Co-operation and Development, OECD, warned in May 2025 that global excess capacity in steel threatens market stability, employment and decarbonisation plans. The OECD estimates that excess capacity in the steel industry could reach 721 million tonnes by 2027, with a strong impact from subsidies and other market distortions, especially outside the circle of developed economies. The report also states that Chinese steel exports have more than doubled since 2020 and that this has intensified pressure on producers in numerous countries.
This does not mean that every U.S. claim will automatically be confirmed, but it does mean that Washington can more easily defend its new offensive politically and in communication terms. When the official U.S. argument about protecting the industrial base is combined with international warnings about market distortions, the result is a narrative that carries great weight in domestic politics. Especially in electoral and post-electoral America, where trade has for years been viewed as an issue of national security, of jobs, and of geopolitical power.
The U.S. trade deficit and the political logic of the move
U.S. macroeconomic data provide additional political material for advocates of a tougher approach. According to the U.S. Bureau of Economic Analysis and the Census Bureau, the deficit in trade in goods and services in December 2025 amounted to 70.3 billion dollars, which is a significant increase compared with November. At the level of the whole of 2025, the total deficit in goods and services amounted to 901.5 billion dollars, while the deficit in goods alone reached 1.2409 trillion dollars. Although economic experts warn that the trade deficit is not in itself a simple measure of economic health and depends on a much broader set of factors, in Washington’s political communication such numbers serve as proof that the existing international trade order has not worked in favor of U.S. industry.
That is precisely why the Trump administration is trying to present trade policy as a tool of reindustrialisation. In that logic, tariffs are not only a punishment for foreign partners, but an instrument by which production is brought back to the United States, supply chains are secured and strategic dependence on imports is reduced. Critics, however, warn that this argument is only partially sustainable. Tariffs can indeed protect certain sectors, but at the same time they raise costs for companies that import raw materials and components, create the risk of retaliation by trading partners and can further fuel inflationary pressures on U.S. consumers.
Supply chains and import-dependent industries are the most exposed
The consequences of the new investigations will not be felt only when, and if, new tariffs are introduced. The announcement alone is already increasing uncertainty in supply chains. Importers must already assess whether orders from Asia, Europe or Mexico will become more expensive in a few months. Manufacturers operating on thin margins may, because of that uncertainty, delay investments, shift part of their orders to alternative markets or seek new suppliers within North America. Such adjustments are neither immediate nor cheap, especially in industries where supplier relationships depend on long certification and logistics processes.
An additional complexity lies in the fact that the list includes both allies and competitors. Europe, Japan, South Korea, Taiwan and Mexico are not only exporters to the United States, but also key links in U.S. strategic supply networks, including the automotive industry, electronics, defense systems and advanced technologies. Because of that, any expansion of the trade conflict has a double effect: Washington can politically signal that it is protecting domestic production, but at the same time it risks increasing the cost of inputs precisely for the sectors it wants to strengthen.
What this means for relations with allies
One of the most delicate elements of this story is the fact that the covered economies are not only countries with which the United States has open political or trade frictions. The list also includes the European Union, Japan, India, Mexico and other countries with which Washington is simultaneously conducting, or wants to conduct, negotiations on broader security, technological and investment arrangements. Precisely because of that, there is a possibility that the investigations will also serve as a negotiating tool, not only as a prelude to direct punishment through tariffs.
Such an approach is not new. In recent years, U.S. trade policy has often combined the threat of tariffs with the offer of bilateral or plurilateral agreements. Translated, the message to partners is that it is easier to reach a political agreement and certain concessions than to risk a long-lasting tariff conflict. However, such tactics at the same time undermine allies’ trust, because they show that even a formal partnership does not guarantee exemption from U.S. protectionism. This further fuels the debate over how predictable the American economic direction is during Donald Trump’s term.
Markets are watching legal, not only political, risk
For financial markets and companies, the legal dimension may be even more important. After the court struck down part of the earlier tariffs, investors no longer observe only the political intention of the White House, but also the durability of the legal mechanism on which the new measures will be built. Section 301 is slower and administratively more demanding than extraordinary presidential powers, but it is also a far better known tool with an already rich practice. In Trump’s first term, it was precisely on that basis that major tariffs on Chinese goods were introduced, many of which remained in force in the following years.
This means that markets do not see the new investigation as a symbolic gesture, but as a process with real prospects of producing concrete and longer-lasting measures. At the same time, the very fact that the procedure includes comments, hearings and consultations leaves room for negotiations, partial exemptions and political compromises. That is why this phase may be even more sensitive for companies than the possible announcement of new tariffs itself: uncertainty is high, and the final scope of the measures is still not known.
Washington is sending the message that trade is once again becoming an instrument of industrial policy
The broadest message of this U.S. decision is that in 2026 trade policy is being used ever more openly as an extended arm of industrial policy. In the explanation of the investigation, the USTR directly speaks about protecting the industrial base, bringing back key supply chains and creating well-paid jobs in U.S. manufacturing. Such wording shows that Washington is no longer hiding the fact that tariffs and trade investigations are not merely a correction of market irregularities, but a means of reshaping production geography.
That is precisely why the new round of investigations goes beyond a daily trade news item. It raises the question of whether the world economy will in the coming months once again face strengthening fragmentation, higher costs of cross-border exchange and new pressure on industrial goods prices. If the administration turns the investigations into a broad wave of new tariffs, the consequences will not be measured only in political points in Washington, but also in how much the flows of goods between America, Asia and Europe will change. For global business, this means that trade policy, after a short period of legal standstill, is returning to the center of economic uncertainty.
Sources:- U.S. Trade Representative – official announcement on the initiation of Section 301 investigations, the list of covered economies and the procedural deadlines (link)- U.S. Trade Representative – announcement on the 2026 U.S. Trade Policy Agenda with confirmation of the direction of U.S. trade policy (link)- The White House – executive action of February 20, 2026, on ending part of the earlier tariff measures while retaining other tariff instruments, including Section 301 and the temporary import surcharge (link)- The White House – fact sheet on the temporary import surcharge and the continued use of tariffs as an instrument of trade policy (link)- AP News – report on the political and economic context after the Supreme Court decision and on the scope of the new investigation (link)- OECD – data on the growth of global excess capacity in the steel industry and the impact on market stability, employment and supply chains (link)- U.S. Bureau of Economic Analysis and U.S. Census Bureau – official data on U.S. foreign trade in December and the whole of 2025 (link)
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