By GRANT TUCKER, ENTERTAINMENT EDITOR and SAM MERRIMAN, SOCIAL AFFAIRS CORRESPONDENT

BBC director-general Tim Davie sensationally quit tonight after a week of crises.

An impartiality row rocked the national broadcaster after an internal report accused it of bias, censorship and doctoring footage of Donald Trump.

Mr Davie admitted 'mistakes' had been made, adding: 'I have to take ultimate responsibility.' Deborah Turness, chief executive of BBC News, also resigned, saying the 'buck stops with me'.

Ms Turness admitted the editing of footage of the US President in a Panorama documentary had caused 'damage' to the BBC.

Mr Trump posted on Truth Social tonight: 'The TOP people in the BBC, including TIM DAVIE, the BOSS, are all quitting/FIRED, because they were caught "doctoring" my very good (PERFECT!) speech of January 6th.'

White House press secretary Karoline Leavitt said last week that the corporation was '100 per cent fake news'. Ms Leavitt last night posted a screenshot of her comments alongside the corporation's announcement of Mr Davie's resignation. She captioned the tweet: 'Shot' and 'Chaser'.

Both executives have resigned rather than been sacked, with BBC chairman Samir Shah calling it a 'sad day'.

A BBC insider told the Daily Mail that Mr Davie was 'furious' at political leaders who 'jumped on the report to bring him down'.

Tim Davie admitted 'mistakes' had been made, adding: 'I have to take ultimate responsibility'

Deborah Turness (pictured), chief executive of BBC News, also resigned, saying the 'buck stops with me'

Tory leader Kemi Badenoch said on Wednesday that 'heads should roll' over the revelations, which she branded 'absolutely shocking'.

Former prime minister Boris Johnson said in his Mail column on Saturday - later shared online by Mr Trump - that Mr Davie either had to break his silence and explain the Trump incident or resign, or he would refuse to pay his licence fee. Reform leader Nigel Farage accused Mr Davie of 'double standards' over his handling of the crisis.

The Mail on Sunday further revealed how two of the BBC's leading presenters claimed that airing concerns about its coverage was part of a political campaign to 'destroy' the corporation. Nick Robinson's remarks - endorsed by veteran reporter John Simpson - were swiftly condemned as 'ridiculous' and 'arrogant' by Mr Johnson.

Mrs Badenoch said tonight it was 'right that Tim Davie and Deborah Turness have finally taken responsibility and resigned'.

But she added: 'Let's be honest, this has been a catalogue of serious failures that runs far deeper.

'The Prescott report exposed institutional bias that cannot be swept away with two resignations - strong action must be taken on all the issues it raised.

'The culture at the BBC has not yet changed. BBC Arabic must be brought under urgent control. The BBC's US and Middle East coverage needs a full overhaul. And on basic matters of biology, the corporation can no longer allow its output to be shaped by a cabal of ideological activists.

White House press secretary Karoline Leavitt posted a two-word response to Mr Davie's departure alongside two screenshots of news articles

Mr Trump also shared a Daily Mail column from Boris Johnson, where the former Prime Minister vowed to withhold his licence fee over the impartiality issue

Read MoreLIVE BBC crisis live updates: White House gloats as DG Tim Davie quits over Trump speech row

'The new leadership must now deliver genuine reform of the culture of the BBC, top to bottom.'

Senior Tory MP James Cleverly said the BBC's problem was 'a failure to recognise its own bias'.

He added: 'They saw each "mistake" as being in isolation and couldn't or wouldn't see a wider pattern. I want the BBC to succeed, it's a powerful British brand, but it needs a proper kick up the arse for that to happen. Perhaps this is it.'

Mr Davie's resignation brings to an end to a 20-year career at the BBC which saw him rise from director of marketing, communications and audiences.

Since he took the top job in 2020, the corporation has faced many crises, including the prosecution of newsreader Huw Edwards over possession of indecent images of children, the axing of MasterChef presenters Gregg Wallace and John Torode, and the airing of a performance of Bob Vylan at Glastonbury, when its lead singer chanted 'Death to the IDF'.

But it was a report by Michael Prescott, a former adviser to the corporation's editorial watchdog, which brought down the director-general. In a 19-page document, he accused corporation of doctoring a speech by Mr Trump and censoring the debate on transgender issues, and said its Gaza coverage had been biased.

Mr Davie said he wanted to hand over to a new director-general ahead of Royal Charter renewal negotiations with the Government, which will decide the broadcaster's future funding model.

Read More BORIS JOHNSON: I won't pay my licence fee until Tim Davie comes clean on doctored Trump speech

In a note to staff tonight, he said: 'Like all public organisations, the BBC is not perfect, and we must always be open, transparent and accountable. While not being the only reason, the current debate around BBC News has understandably contributed to my decision.

'Overall the BBC is delivering well, but there have been some mistakes made and as director-general I have to take ultimate responsibility.'

BBC chairman Mr Shah said: 'This is a sad day for the BBC. Tim has been an outstanding director-general for the last five years. He has had the full support of me and the board throughout. However, I understand the continued pressure on him, personally and professionally, which has led him to take this decision. The whole board respects the decision and the reasons for it.'

Ms Turness, who was poached from ITN by Mr Davie three years ago, told staff: 'The ongoing controversy around the Panorama on President Trump has reached a stage where it is causing damage to the BBC - an institution that I love. In public life, leaders need to be fully accountable, and that is why I am stepping down.

'While mistakes have been made, I want to be absolutely clear recent allegations that BBC News is institutionally biased are wrong.'

Mr Farage said the resignations 'must be the start of wholesale change'. He added: 'The Government need to appoint somebody with a record of coming in and turning companies and their cultures around. This is the BBC's last chance. If they don't get this right, there will be vast numbers refusing to pay the licence fee.'

Culture Secretary Lisa Nandy said: 'I want to thank Tim Davie for his service to public broadcasting over many years. As a Government, we will support the board as it manages this transition and ensure that the Charter Review is the catalyst that helps the BBC to adapt to this new era.'

Mr Davie's resignation came hours after the Mail contacted the BBC with serious allegations that its board had ignored calls for an investigation into anti-Semitism at the corporation.

The Campaign Against Antisemitism has called for an independent inquiry. It added tonight: 'Until that independent inquiry comes, it is unconscionable to force taxpayers to pay for the biased, sanctimonious and unaccountable BBC.'

The Board of Deputies of British Jews called for 'deep cultural change' at the corporation, adding that the two resignations 'must be seen as the beginning, rather than the end, of a process of renewal'.

BBC bosses quit after corporation admits doctoring Trump video