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The Commons reacted with fury to Boris Johnson's casual dismissal of an MP's daily death threats.

He rubbished concerns raised by Labour MP Paula Sherriff and other MPs about his "inflammatory" language.

Ms Sherriff shook with rage as she told the Prime Minister: "I genuinely do not seek to stifle robust tonight.

"But this evening the Prime Minister has continually used perjorative language to describe an Act of Parliament passed by this House.

"And I'm sure you would agree Mr Speaker that we should not resort to using offensive, dangerous or inflammatory language for legislation that we do not like.

"And we stand here Mr Speaker under the shield of our departed friend!

The MP for Dewsbury has spoken about not being able to return home on police advice following death threats.

Her voice broke as she told the Commons of the death threats she receives every single day.

She said: "With many of us in this place subject to death threats and abuse every single day!

"And let me tell the Prime Minister - they often quote his words! Surrender act. Betrayal. Traitor. And I for one am sick of it.

"We must moderate our language - and it has to come from the Prime Minister first.

"He should be absolutely ashamed of himself!"

(Image: AFP/Getty Images)

Yet despite Labour MPs applauding the impassioned plea the Prime Minister replied casually: "I've never heard such humbug in all my life."

Labour MPs roared "shame!", "disgusting!", "disgrace!" and "how can you sit behind him?" to Tory benches as the Prime Minister shook his head.

After an intervention from Speaker John Bercow, Boris Johnson defended his decision to call a Bill that would delay Brexit by three months "the Surrender Act".

Ms Sherriff referred to her former colleague Jo Cox who was murdered seven days ahead of the referendum by a right wing extremist who shouted "Britain First".

She gestured to Ms Cox's shield is on the wall of the chamber.

Jo Cox’s friend and MP for Leeds West Rachel Reeves tweeted: "Appalled by the Prime Minister this evening. He breaks the law and uses dangerous language that stokes division and worse in our communities. Then he get applauded by his MPs for doing so. It is unworthy of the position of PM. Utterly depressing."

She got up and left the chamber.

Referring to the murder of her friend Jess Phillips shouted: “Remember that? I remember every day”.

Jess Phillips walked out after the Prime Minister again described the anti-no deal Benn bill as the “surrender act”.

Liz McInnes was heard to comment: “it’s so inflammatory”.

Mr Johnson later told Tracey Brabin, who took over the Batley and Spen seat after Jo Cox was murdered, that the best way to honour the late MP was to "get Brexit done".

Liberal Democrat leader Jo Swinson later tweeted: "Paula Sherriff made heartfelt plea for him to stop using inflammatory words like 'surrender'.

She pointed at the plaque for murdered MP Jo Cox, and regular death threats MPs face, quoting such language. Johnson said "humbug". Utter disgrace."

Jo's widower Brendan Cox tweeted: "Feel a bit sick at Jo’s name being used in this way.

"The best way to honour Jo is for all of us (no matter our views) to stand up for what we believe in, passionately and with determination. .

"But never to demonise the other side and always hold onto what we have in common."

Labour MP Karen Buck said: “He will be accountable for the consequences of that language”.

Shadow Health Secretary Jon Ashworth said the PM should "retract, apologise and not repeat" those words.

Later during the debate the Prime Minister effectively told Labour's Anna McMorrin that the only way to stop the social media abuse she gets is to let him have his way.

Ms McMorrin told the Commons: "I have never felt so embarrassed to be a Member of Parliament than] here this evening.

"We know the impact the Prime Minister's language and behaviour is having on the people out there in the country and on us as Members of Parliament.

"I alone have seen a huge escalation just today of the abuse on social media and the language and incitement that he is causing. This has got to stop.

(Image: AFP/Getty Images)

"So why doesn't he listen to what the court said yesterday, say sorry about that, say sorry, and then let's do the democratic thing and actually, yes, let's put it back to the people for a final say."

Mr Johnson replied saying: "I'm mindful of what you have said about the Surrender Act. I must say that I do appreciate that tensions on this matter are high.

"But I want to be very clear with the honourable lady opposite.

"There is only one way to end those tensions in this country and that is to get Brexit done.

"If she really thinks that by staying on in the EU month after month after October 31st, those tensions, that acrimony, that storm on Twitter is going to abate, she's got another thing coming."

Labour MP Alison McGovern said: "Those of us who constantly remember our friend Jo Cox need our political culture to change now.

"It is getting toxic. The Prime Minister's language is violent, and his Government is dysfunctional."

She called on Mr Johnson to "take responsibility" and to "accept he acted unlawfully" and tell the Commons which of his ministers will now resign.

Mr Johnson said he agreed that tempers have become "very ragged" across the country. He said the best way to bring people together is to "get Brexit done".