Donald Trump has threatened to sue the BBC for $1bn.

Our US partner NBC News has obtained the letter sent from the US president's lawyers to the BBC yesterday.

Trump's lawyers set the BBC a deadline of 5 pm EST (10 pm in the UK) on Friday, 14 November to "comply".

If not, the letter from Trump's legal team says: "President Trump will be left with no alternative but to enforce his legal and equitable rights, all of which are expressly reserved and are not waived, including by filing legal action for no less than $1,000,000,000 (One Billion Dollars) in damages. The BBC is on notice."

Trump's lawyers are demanding a retraction.

A spokesperson for Trump's legal team tells NBC: "The BBC defamed President Trump by intentionally and deceitfully editing its documentary in order to try and interfere in the Presidential Election. President Trump will continue to hold accountable those who traffic in lies, deception, and fake news."

A BBC spokesperson tells NBC News: "We will review the letter and respond directly in due course."

The White House referred a request for comment to the outside legal team.