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Claire Greer, GMB Scotland organiser, said the company revised its offer after talks with conciliation service Acas but only made it worse.

Several experts contacted by the BBC said they expect Bessent to now take a much more prominent public role in tariff policy, with Lutnick taking charge of the negotiations, while Navarro, Hassett and Greer playing supporting roles.

One, US Trade Representative Jamieson Greer, was just a short drive away on Capitol Hill, testifying about tariffs before a House of Representative committee.

US trade representative Jamieson Greer was asked whether there were any plans for Trump to speak with his Chinese counterpart, Xi Jinping, during an appearance on CBS's Face the Nation on Sunday.

Speaking to Congress on Tuesday, Jamieson Greer, who leads the office of the US Trade Representative, declined to set a timeline for how quickly talks might progress.