The EU has said it “strongly” regrets Donald Trump’s surprise plan to double US tariffs on steel and aluminium in a move that risks throwing bilateral trade talks into chaos. On Friday, the US president told a rally in the steel-making city of Pittsburgh that the tariffs would rise from 25% to 50%, claiming this would boost local industry and national supplies.The European Commission told the BBC on Saturday that Trump’s latest move on tariffs “undermines ongoing efforts” to reach a deal, warning about “countermeasures”.This also raises questions about the UK’s zero tariff deal with the US on steel and aluminium which, although agreed, has not yet been signed.In a statement sent to the BBC on Saturday, the European Commission, the EU’s executive arm, said: “We strongly regret the announced increase of US tariffs on steel imports from 25% to 50%.”This decision adds further uncertainty to the global economy and increases costs for consumers and businesses on both sides of the Atlantic.”The tariff increase also undermines ongoing efforts to reach a negotiated solution.”In good faith, the EU paused its countermeasures on 14 April to create space for continued negotiations,” the statement said, warning the bloc “is prepared to impose countermeasures”.On Friday, Trump announced the tariff rate on steel and aluminium imports would double to 50%, starting on Wednesday.He said the move would help boost the local steel industry and national supply, while reducing reliance on China.Trump also said that $14bn (£10bn) would be invested in the area’s steel production through a partnership between US Steel and Japan’s Nippon Steel, though he later told reporters he had yet to see or approve the final deal.The announcement was the latest turn in Trump’s rollercoaster approach to tariffs since re-entering office …