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Boris Johnson was steamrollered on live TV today as he admitted the NHS will NOT get £350million a week extra after Brexit .

The Foreign Secretary was pursued over the false boast he backed in the EU referendum campaign by Good Morning Britain presenter Susanna Reid.

She grilled him as he repeatedly tried to change the subject back to his attack on "mutton-headed old mugwump" Jeremy Corbyn .

Mr Boris used the bizarre description as he sprang into life in the Tory election campaign following reports he would be sidelined.

In a searing newspaper article the Foreign Secretary accused Mr Corbyn of using "meandering and nonsensical" language.

But it was him who was caught meandering when a photo of him with the slogan "let's give our NHS the £350million the EU takes every week" was brought up on screen.

Experts and even Nigel Farage say the actual figure is around half that or less - once payments back to Britain, and the automatic rebate negotiated several years ago, is factored in.

It comes as the Association of the British Pharmaceutical Industry - worth £30billion - warns today it could quit Britain if health spending does not rise.

(Image: ITV) (Image: ITV)

Ms Reid pointed out Health Secretary Jeremy Hunt had visited the ITV studio just a day earlier and warned a bad Brexit will give the NHS less money.

"He doesn't back up that claim of £350million for the NHS and he's the man in charge of the NHS!" she said.

Quoting Labour, she added: "Why should anyone believe a word he says?"

Mr Johnson repeatedly tried to change the subject to leadership - saying Theresa May in office was the only chance to get money back.

But Ms Reid said: "That isn't actually the accurate amount of what we contribute."

Mr Johnson finally admitted: "£350m is the global figure of what we don't control... The net contribution is about £10billion a year."

(Image: Getty)

He insisted the figure was "not disputed", but then admitted: "£350million is the sum we do not control.

"A certain amount of that, as I said until I was blue in the face, is spent at the behest of the EU in this country, about £175million."

That means the total extra amount spent in Britain each week will be nowhere near £350million.

Wounded Mr Johnson also reacted to claims he could be sidelined in the election campaign, saying: "I have not been kept under wraps!"

And he defended his failure to win sanctions against Russian generals with links to the Syrian chemical attack - his biggest flop on the world stage.

"There was never a prospect of getting new sanctions on Russia," he said - later clarifying he had pushed for them on Russian generals, if not the country.

In an article for the Sun newspaper today, Mr Johnson claimed the "biggest risk" with Jeremy Corbyn is "people just don’t get what a threat he really is."

(Image: AFP)

Without a hint of irony, he accused the Labour leader of "meandering and nonsensical" language before writing: "[People] say to themselves: he may be a mutton-headed old mugwump, but he is probably harmless.

"Have you ever thought the leader of the Opposition is an essentially benign Islingtonian herbivore? Have you felt a pang of sympathy for his plight? If so, fight it."

Mr Johnson pointed to the threats from Russia and North Korea and said the consequences of a Labour government would be "calamitous".

He also accused Labour of playing "hokey cokey" on the EU because it can't decide whether it's in or out.

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But Shadow Foreign Secretary Emily Thornberry said: "It seems Boris Johnson has finally been allowed out of hiding, on the condition he only talks delusional nonsense."

Shadow Housing Secretary John Healey told Sky News: "I really think this is Boris Johnson feeling left out of the general election campaign and this is 'look at me name-calling'.

"To be quite honest this demeans the position of the Foreign Secretary. I would say to him don't attack the person - debate the policy.

"And if you and your party want to put Jeremy Corbyn on the spot let's see the leaders debate on TV so people can make up their own minds."