Donald Trump will seek to reorient his campaign this week amid alarm in the Republican party, with a new economic plan which includes claims that he can double US economic growth by imposing fresh tariffs on China and renegotiating global trade rules.

In Detroit on Monday, Mr Trump will lay out a proposal to stimulate the country’s recent lacklustre economic growth through trade and tax incentives aimed at pushing American businesses to bring home jobs and overseas profits, advisers told the Financial Times.

It is an attempt by Mr Trump and his staff to refocus their campaign on the economy, one of the few areas where polling had shown the property developer to be stronger than Hillary Clinton but one where the Democratic nominee has been gaining ground.