Exclusive: Sources say US wants information on when importing of raw materials from abroad at Port Talbot site will stop

Donald Trump is threatening to keep 25% tariffs on some or all of its steel imports from the UK unless it gives specific guarantees over the Indian-owned steelmaking plant at Port Talbot in south Wales, sources have told the Guardian.

An agreement to reduce tariffs on UK car exports to the US and scrap them for the aerospace sector was signed off by the US president and Keir Starmer on Monday, on the sidelines of the G7 summit in Canada.

However, it did not include the removal of tariffs on steel imports from the UK. Officials are still negotiating over the fine points of a deal to cover the steel and aluminium industry, amid US concerns about the fact that Tata Steel imports raw materials from abroad.

Starmer told reporters in Banff, Canada: “There’s further work to do in relation to steel, but we’re getting on and doing that work.”