The BBC has been plunged into an impartiality crisis as US President Donald Trump threatens to sue the corporation for $1billion.

Outgoing director-general Tim Davie will address BBC staff on Tuesday morning after Trump’s legal team gave the broadcaster until Friday to apologise after it emerged that a speech by the president had been “doctored” in a Panorama special.

Question marks remain over who will replace Mr Davie at the top of the corporation, who will leave the BBC after 20 years “over the coming months”.

Mr Davie’s resignation could lead to the BBC having a woman at the helm for the first time in its history.

The BBC’s chairman, Samir Shah, had said he “did not want to lose” Mr Davie after he resigned on Sunday.

Mr Davie’s departure came after a report by Michael Pres

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