Britain’s spy agencies risk having their intelligence methods revealed if Donald Trump releases a controversial memo about the FBI, congressional figures have warned.

The UK will be less likely to share confidential information if the secret memo about the Russian investigation is made public, according to those opposing its release.

Mr Trump is expected to tell Congress on Friday that he has no objections to the memo being released. He is also not likely to request that any of part of it be redacted, senior sources in the administration have told US media.

A source in US Congress looking into Russian election meddling told The Telegraph that Britain’s security services would be “rankled” if the information is made public.

Figures in America's Justice Department have also reportedly been warning that the UK-US intelligence sharing relationship could be damaged by the move.