David Davis has been accused of working a three day week and being a 'bully' who needs aides to make his lunch and work his phone in an extraordinary Twitter rant by his former chief of staff.

The Brexit Secretary, 68, has been besieged by James Chapman in a series of incendiary tweets which began in the early hours of yesterday and are continuing today.

Mr Chapman, 40, who quit during the last election, claims Mr Davis needs an 'unfortunate woman' to make his ham sandwiches, asked another worker put Nigel Farage on 'speed dial' and can't be 'bothered' to read the contents of his ministerial box.

He also claimed his former boss displayed 'drunk, bullying and inappropriate' behaviour while 'leering' at shadow home secretary Diane Abbott, and has upset foreign leaders during Brexit negotiations.

Mr Davis has refused to respond to his sensational claims - or criticise his former chief of staff - saying he did a 'great job' even though he 'was a Remainer'.

But Mr Chapman only responded with yet another stinging rebuke and said: 'Wish I could say the same for DD [David Davis]. He's been working 3 day week since day one'.

Brexit Secretary David Davis has faced an onslaught of tweets from his former chief of staff James Chapman (pictured together) who accused him of being workshy and a 'bully'

Mr Chapman tweeted, liked or retweeted more than 250 messages in 12 hours with many aimed at his former boss

James Chapman's Twitter rant at David Davis and his colleagues 'I was with DD when he leered over @hackneyabbott. He was drunk, bullying and inappropriate' 'Someone should ask DD about time he told horrified Slovakian PM "if you think we are going to pay so you can sell us your cars, forget it". 'DD would know if he ever bothered to read his box' 'Brexiteers asking if I have "gone mad". Well, I am incandescent at what they’ve done to my children’s country' 'I say to my former colleagues @dexeugov [The Department for Exiting the European Union] — enough is enough. You’re being asked to facilitate misconduct in public office. Please resign” 'Any #conkip MP who continues to sit with lying enemies of the state @borisjohnson IDS and Mogg deserves what’s coming #thedemocrats' 'He [DD] can’t even make plain ham sandwiches (no butter) — an unfortunate woman in his private office has to bring one to him every day” 'Wish I could say the same for DD. He’s been working 3 day week since day one #byebyeconkip #thedemocrats” 'I sat in meetings with EU ministers politely appalled by buffoon @BorisJohnson’s insistence UK would ‘have cake and eat it’ #byebyeboris” 'Hey @LiamFox is it true @number10gov locked you in toilet on trip with @theresa_may as you were being typically embarrassing?' 'Let's make @theresa_may the last ever @conservatives PM - she's already the worst #thedemocrats #wemarch' Advertisement

His extraordinary claims were in an onslaught of 250 tweets sent, liked or re-tweeted in just 12 hours yesterday, where he also called on Theresa May to resign and claimed BBC presenters including John Humphrys and Andrew Neil were too close to the Tories.

In one of several messages aimed at the Prime Minister he said: 'Let's make @theresa_may the last ever @conservatives PM - she's already the worst'.

They tirade continued today where he claimed Liam Fox, Secretary of State for International Trade, was locked in the toilet by Theresa May's aides because he was being 'typically embarrassing' on a foreign trip.

Mr Chapman, who is trying to set up a new pro-EU party called The Democrats after leaving the Brexit department, claimed Mr Davis displayed 'drunk, bullying and inappropriate' behaviour towards shadow home secretary Diane Abbott.

He was referring to when Mr Davis had to apologise for implying Ms Abbott was not attractive enough to kiss in private text messages after the vote to trigger Article 50.

Mr Chapman also alleged Mr Davis had Nigel Farage on speed-dial and tried to get civil servants to store the former Ukip leader's number in his work landline but they refused.

He then claimed that it was 'totally inappropriate' for today presenter John Humphrys to conduct interviews about Brexit because 'he holidays with DD [David Davis]'.

But the show's editor Sarah Sands replied saying this was not true. It is understood Mr Davis also rejects most of Mr Chapman's claims.

Mr Chapman also claimed Mr Davis takes six sugars in his tea and gets someone to stir it for him, that he never reads his the contents of his ministerial red box and that he once insulted the Slovakian Prime Minister by telling him: 'If you think we are going to pay so you can sell us your cars, forget it.'

The former aide then said Mr David 'drinks (lots) together with' the BBC's Andrew Neil, who replied saying: 'Simply untrue. Have dined with DD once in 10 years (you were there), lunched once in 10 years. NEVER had drinks with him in 20 years or more'.

David Davis (right) was accused of being workshy and a bully in an extraordinary Twitter rant by his former Chief of Staff James Chapman (left)

Mr Chapman's incendiary claims about the Tories came as he announced his intention to lead the new party, the Democrats, during the People's March for Europe

Mr Chapman's accusations were among 250 tweets he wrote or retweeted in his tirade yesterday.

Asked what he made of Mr Chapman's recent suggestion that the Brexit department is 'in chaos', Mr Davis told LBC radio: 'James when he came to me was, I mean he was a Remainer, we knew that.

'But he did a good job, he was a good chief of staff. I'm not going to criticise him, I just don't do that, I'm afraid.'

The rant came as Mr Chapman, the former Political Editor of the Daily Mail, announced announced his intention to lead the new party, the Democrats, during the People's March for Europe, which will take place on September 9 in London.

After floating the possibility of a new centrist group earlier this month, Mr Chapman said two Cabinet ministers contacted him expressing sympathy for the call.

He said: 'I did my best to make Brexit work for a year - and it won't. There is no upside and it is clear that every sector of our economy will suffer for decades to come. Project Fear is Project Fact.

'The first duty of our politicians is to stand up for the interests of their constituents - and that means sound money and job opportunities for all.

'The MPs that have left Britain careering towards a cliff worse than Black Wednesday have failed in that duty and are guilty of misconduct in public office.

'The march on Parliament will be for members of all parties and none - but I will be announcing my intention to lead a new party, the Democrats, which will reverse Brexit with no second referendum.

'It's time for all of those with consciences to put nation before country and make sure we are Great Britain once again - not the Little Britain of Nigel Farage and Vladimir Putin's wet dreams.'

'Not true': Some of Mr Chapman's Tweets produced denials from people mentioned in them