The United States has warned that Sir Keir Starmer’s push to bring the UK more closely into line with European Union rules could jeopardize transatlantic trade. It is a rare public intervention that highlights growing tensions over Britain’s post-Brexit strategy.
Warren Stephens said Washington viewed the British government’s plan to reintroduce elements of EU regulation, particularly in agriculture and food standards, as a potential obstacle to trade with the United States.
“To the extent that this impacts U.S. trade and requirements, that will be a problem,” he told a business audience in London, adding that such a move “will not be received favorably in Washington.”
The warning comes as Keir Starmer and Chancellor Rachel Reeves seek closer economic ties with Brussels, including plans to reintroduce a first tranche of 76 EU directives into British law.
The proposed alignment focuses primarily on agricultural and food standards and is intended to facilitate trade relations with the EU and reduce friction for exporters. However, U.S. officials fear this could complicate market access for American goods, particularly where regulatory standards diverge.
Stephens suggested that the UK’s attempt to balance its relationships with both Brussels and Washington could lead to competing pressures.
“I know that the EU is important for Britain and you have to do the best for yourself,” he said. “But it has an impact on our trade relationships.”
The comments also reflect broader frustration in Washington over the pace of progress on the U.K.-U.S. trade deal agreed last year under Donald Trump.
While the agreement entered into force in mid-2025, Stephens noted that the US was interested in faster implementation and deeper integration.
“We are excited about these deals and ready to act,” he said. “We want to see the same urgency from our partners.”
Proposals under discussion include a framework that would allow companies to raise capital in the UK and US markets using domestic regulatory filings, a move aimed at strengthening financial ties between the two economies.
The US ambassador contrasted Washington’s relatively smooth dealings with the UK with what he described as more difficult, despite a trade deal signed last year.
Delays in the ratification of this agreement, partly linked to geopolitical tensions, have underlined the complexity of the EU negotiations and could influence US concerns about the UK moving closer to European regulatory frameworks.
Beyond trade, Stephens also commented on broader economic policy, calling on the UK to make greater use of domestic energy resources, including North Sea oil and gas, to boost competitiveness and reduce costs.
At the same time, he struck a more measured tone on the UK’s engagement with China, recognizing the importance of the market but warning of the need to protect sensitive technologies and intellectual property.
The intervention highlights the UK’s increasingly delicate position as it recalibrates its global relations in the post-Brexit era.
Efforts to rebuild ties with the EU are seen by the government as essential to boosting trade and economic growth. However, the US remains one of Britain’s most important economic partners and any perceived shift towards European alignment risks tensions.
For companies, the potential divergence in regulatory standards raises questions about market access, compliance costs and long-term strategy.
As the UK takes a more pragmatic approach to international trade, a balanced relationship with both the EU and the US will be crucial.
The latest warning from Washington suggests that rapprochement with Brussels could involve compromises and that the path to maximizing economic opportunities could be more complex than expected.
The challenge for policymakers is to manage these competing priorities without jeopardizing the UK’s position in one of its most important trading relationships.
