Donald Trump could sabotage a post-Brexit transatlantic trade deal with the UK if he is not invited to Prince Harry's wedding, according to the author whose explosive book on the American president has roiled US politics.

Michael Wolff says Mr Trump will only respect the Special Relationship if he “gets what he wants”.

The warning comes from a journalist whose book "Fire and Fury: Inside the Trump White House" is drawn from what he said was regular access to the West Wing and more than 200 interviews, including some three hours with Mr Trump himself.