US President Donald Trump said on Friday that he would increase the tariffs charged on cars and trucks from the European Union next week to 25 per cent, a move that could jolt the world economy at a fragile moment.

Trump said in the post that the EU “is not complying with our fully agreed to Trade Deal”, though he did not flesh out his objections in the post.

Trump and European Commission President Ursula von der Leyen had agreed to the trade deal last July. It set a 15 per cent tariff on most goods.

Both the US and the EU had previously confirmed their commitment to preserving the trade framework, known as the Turnberry Agreement, which was named after Trump’s golf course in Scotland.

But the status of the 2025 deal was first cast into doubt after the Supreme Court this year ruled that the Republican president lacked the legal authority to declare an economic emergency and charge tariffs on EU goods.

The initial agreement had been a tariff ceiling of 15 per cent on goods from the EU, but the Supreme Court ruling reduced that to 10 per cent as the Trump administration launched a new set of import taxes based on other laws.