Trump is breaking the Turnberry deal over cars. Semiconductors are next in line.

The Turnberry Agreement was supposed to be the floor. Signed at Donald Trump’s golf resort in Scotland last July, the deal between the United States and the European Union set a 15 per cent tariff ceiling on nearly all EU goods entering America, including cars, car parts, semiconductors, and pharmaceutical products. In exchange, the EU agreed to eliminate tariffs on all US industrial goods, purchase $750 billion in American energy exports, and deliver $600 billion in investments into the United States by 2028. It was, by any measure, asymmetric. The EU accepted it anyway, because the alternative was worse. On Friday, Trump announced on Truth Social that the alternative is back. He will raise tariffs on EU cars and trucks to 25 per cent next week, accusing the bloc of failing to comply with the deal. He did not specify what the EU has failed to do. The European tech industry warned months ago that tariffs would hit both hardware and software. The question now is whether the cars are the beginning or the end of the escalation.

The agreement

The Turnberry Agreement, formally the Agreement on Reciprocal, Fair, and Balanced Trade, was announced on 27 July 2025 and formalised in a framework agreement on 21 August. The deal capped US tariffs on EU goods at 15 per cent, with zero-for-zero arrangements on strategic categories including aircraft components, critical raw materials, and semiconductor equipment. It included cooperation provisions on supply chain security, AI chips, and digital trade. The EU committed to removing tariffs on all US industrial goods and providing preferential access for American agricultural products. European leaders, including German Chancellor Friedrich Merz, criticised the asymmetry but supported the deal as preferable to a full trade war. The European Parliament approved the agreement in March 2026, attaching safeguards that allow the EU to reimpose tariffs if the US violates the terms.

The deal’s legal foundation shifted dramatically on 20 February 2026, when the US Supreme Court ruled in Learning Resources Inc. v. Trump that the International Emergency Economic Powers Act does not authorise the president to impose sweeping tariffs. Within hours, the White House reimposed a 10 per cent universal import surcharge under Section 122 of the Trade Act of 1974, which carries a 150-day time limit. The Turnberry Agreement was negotiated under IEEPA authority. The Supreme Court ruling did not invalidate the agreement itself, but it changed the legal instrument through which the tariffs are administered, creating ambiguity about which provisions remain enforceable and on what timeline. The EU froze its ratification process in February, seeking clarity on whether the deal’s terms still held. By March, the US Trade Representative had launched Section 301 investigations into 16 economies, including the EU, covering steel, aluminium, autos, batteries, and high-tech goods.

The threat

Trump’s announcement is specific to cars and trucks. The tariff will rise from the current rate, which sat at 10 per cent following the Supreme Court ruling, to 25 per cent. He stated that European automakers that produce vehicles in American plants will face no tariff, a provision designed to accelerate the reshoring of manufacturing. Trump claimed that over $100 billion is being invested in US auto plants, calling it a record. Fact-checkers have noted that many of the investments cited by the White House are reallocations at existing facilities rather than new plant construction, and that some were announced before Trump’s re-election. Toyota publicly pushed back on the characterisation of its $10 billion commitment as a new investment. International automakers have collectively invested more than $124 billion in US operations to date, but much of that spending predates the current tariff regime.

The immediate market reaction was measured. The S&P 500 held its gains on Friday, but European automakers fell: Stellantis dropped more than 2 per cent, and Ferrari declined nearly 1.5 per cent. The EU had estimated that the Turnberry deal saved European automakers between 500 million and 600 million euros per month compared to pre-deal tariff levels. A 25 per cent rate would eliminate those savings and then some. BMW’s Spartanburg plant in South Carolina, the largest BMW facility in the world, already produces vehicles for the American market. Stellantis has announced $13 billion in US investment to increase production capacity by 50 per cent over four years. The automakers with American manufacturing are partially insulated. The ones shipping finished vehicles across the Atlantic are not.

The tech question

The Turnberry Agreement covered more than cars. Its zero-tariff provisions on semiconductor equipment and its cooperation framework on AI chips and digital trade were, for European technology companies, the most consequential elements of the deal. Trump’s tariffs have already reignited Europe’s push for cloud sovereignty, with governments from France to Germany investing in domestic alternatives to American digital infrastructure. The 25 per cent auto tariff is not, in itself, a technology story. But the principle it establishes is. If Trump is willing to breach the Turnberry ceiling on cars because of unspecified compliance failures, the same logic can be applied to any category the agreement covers.

The Section 301 investigations launched in March explicitly include high-tech goods alongside autos and batteries. The semiconductor tariff, which Trump initially proposed at 100 per cent before it was modified under Turnberry, remains a live issue. Apple pledged $100 billion in American manufacturing investment partly to secure exemptions from chip tariffs. European chipmakers and equipment manufacturers, including ASML, do not have equivalent commitments. The risk of Europe surrendering its tech sector to American platforms was already a concern before the tariff escalation. If the Turnberry framework that protected semiconductor equipment and digital trade provisions collapses alongside the auto provisions, European technology companies face a fundamentally different operating environment for transatlantic commerce.

The pattern

Trump’s tariff announcements follow a consistent pattern. A social media post establishes the threat. The threat is framed as a response to foreign non-compliance, without specifying the violation. The remedy is a tariff increase. The escape clause is domestic production: build in America and pay nothing. The pattern has been applied to China, Canada, Mexico, and now, again, to the European Union. The auto tariff is not the first time the Turnberry ceiling has come under pressure. The EU postponed its ratification vote in February after the Supreme Court ruling created uncertainty. The US Trade Representative’s Section 301 investigations in March signalled that the administration was building legal infrastructure for broader tariff actions. The auto announcement on Friday is the first concrete breach of the Turnberry framework by the American side.

The EU has been investing in sovereign alternatives, awarding 180 million euros in sovereign cloud contracts and accelerating domestic semiconductor production under the European Chips Act. Rising geopolitical tensions have already increased European infrastructure costs, making the continent’s digital economy more expensive to operate. The tariff threat adds another layer of cost and uncertainty. European technology companies that sell hardware into the American market, or that depend on American cloud infrastructure for their operations, now face the possibility that the trade framework they planned around no longer holds.

The deal that was not a deal

The European Parliament’s safeguards, attached when it approved Turnberry in March, included provisions allowing the EU to reimpose tariffs if the US violated the agreement. Those provisions were designed for exactly this scenario. Whether the EU invokes them depends on politics as much as trade law. Retaliatory tariffs on American goods would escalate the dispute. Absorbing the 25 per cent auto tariff without response would signal that the Turnberry Agreement’s terms are negotiable by social media post. The EU’s trade commissioner will face the same choice that every trading partner of the United States has faced since 2025: respond and risk escalation, or absorb and risk precedent.

Trump’s post ended with a line that reads like a form letter and functions like a threat: “Thank you for your attention to this matter.” The matter is not cars. The Turnberry Agreement was the transatlantic trade framework that covered automobiles, semiconductors, AI, energy, agriculture, and digital commerce. If the auto provisions can be overridden by a social media post citing unspecified non-compliance, the semiconductor provisions can be overridden the same way, and so can the digital trade provisions, and so can the energy commitments. The cars are the test. The technology is the stakes.