Alastair Campbell and Boris Johnson's biographer Andrew Gimson clashed over the Prime Minister's conduct during the Brexit process. Mr Gimson slammed the ITV presenter and Remainer as still angry over Brexit rather than Boris' behaviour during the clash on Good Morning Britain.

       Mr Gimson said: "If you are having a major negotiation you do not say at the beginning my bottle line is, basically I would settle for this.

       "Johnson said he would leave without a deal, well no one ever knew whether that was the truth or not.

       "That was part of the point of it."

       Mr Campbell replied: "After he did the deal he said something that was untrue."

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       Boris Johnson's biographer interjected: "Oh dear Alastair you are getting very angry.

       "Basically, you are not angry about the lies, you are angry about Brexit."

       Mr Campbell responded: "No I am not actually, well I am angry about Brexit."

       The UK voted to leave the European Union during the 2016 Brexit referendum.

       Theresa May was originally tasked with delivering the UK's exit from the trade bloc, however, she was later replaced by Boris Johnson as Conservative Party leader.

       Theresa May had voted remain during the 2016 referendum while Boris had campaigned for leave.

       Last month, Andrew Neil issued a savage assessment of the UK's journey to complete the Brexit, describing the process as gruelling.

       The GB News presenter also lambasted Theresa May's performance in the 2017 general election which resulted in the Conservative Party losing its majority.

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       Mr Neil said: "British politics entered a miserable period of drift and dither made even worse when Theresa May's cack-handed 2017 election campaigned through away the Tory majority.

       "There were times when it seemed Brexit might not happen at all.

       "The saga only came to an end when Boris Johnson won by an unexpected landslide in December 2019."

       He added: "We did not finish the transition until this January, a gruelling four and a half years after we voted to leave."