The Lib Dems are pointing to a recent study suggesting 20% tariffs - or charges - on UK exports to the US could cost the British economy £22bn a year. Lib Dem leader Sir Ed Davey said the public deserved to know the level of risk to the UK's economy, jobs and living standards, and called on the government to "come clean" now.

Donald Trump came to Washington eight years ago vowing to rewrite U.S. trade relationships, shrink a massive goods trade deficit and rebuild America's industrial base with new tariffs. The president-elect is about to embark on an even more aggressive effort in his second term,