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John Major today demanded an 'unreserved apology' from Boris Johnson after the Supreme Court condemned his illegal prorogation of Parliament.

The Tory former premier, who was part of the successful legal challenge, launched an extraordinary attack at his successor in the wake of the ruling.

Insisting he took no 'pleasure' in the court victory, Sir John warned: 'No prime minister must ever treat the Monarch or Parliament in this way again.'

Mr Johnson was dealt a massive blow this morning as judges ruled unanimously that he suspended Parliament illegally in an 'extreme' move to 'frustrate' debate on Brexit.

The decision sparked resignation calls and sent politics into complete chaos. Mr Johnson watched the decision from his hotel room thousands of miles away in New York, where he is attending a UN summit. He said he 'strongly disagrees' with the outcome and it was making his job of getting a Brexit deal harder, but would respect it.

Meanwhile, the Labour Party conference is being effectively cut short so Jeremy Corbyn can return to the Commons when it sits again tomorrow - and there is speculation Tory conference this weekend might have to be cancelled.

The president of the Supreme Court, Lady Hale said the PM's decision to ask the Queen to shut down the Commons for five weeks was 'unlawful, void and of no effect' with John Bercow pledging to recall MPs to the Commons immediately.

John Major (pictured in Westminster this summer) demanded an 'unreserved apology' from Boris Johnson after the Supreme Court condemned his illegal prorogation of Parliament

Mr Johnson is currently in New York (pictured) where he is to meet US President Donald Trump later for talks at the United Nations General Assembly

Reacting to the news, Sir John said: 'I am delighted that the court has ruled the Prime Minister's lengthy and contentious prorogation of Parliament to be unlawful.

'This was a case that should never have had to be considered, and it gave me no pleasure to be pitted against a Government and Prime Minister of my own party.

'Parliament must now be recalled immediately to recommence its work, and to receive the Prime Minister's unreserved apology.

'No prime minister must ever treat the Monarch or Parliament in this way again.'

Tory MPs suggested Mr Johnson would simply 'ignore' calls for his resignation. 'He is a big boy,' one said.

Brexit Party leader Nigel Farage told MailOnline he could take issue with the 'tone' from the Supreme Court, but 'the judgement is the judgement'.

'I just think that in the end the decision to call a Queen's Speech and have the prorogation of Parliament has turned out to be one of the worst political decisions ever,' he said.

'I think Mr Cummings will get his marching order pretty quickly.'

He added: 'We could take issue with the judgement, we could take issue with the tone if we want to.. but I don't think that is the issue.

'The issue now is how Parliament sorts out this mess. A general election in November now looks absolutely inevitable.'

Tory MPs said 'fingers would be pointed' over the massive setback, and suggested Mr Cummings could end up being the fall guy.

'He was always going to be a short term appointment anyway,' one senior MP told MailOnline.

But they added that Commons procedure adviser Nikki da Costa could also bear the brunt of a backlash. 'Nikki da Costa might get the bullet on this one,' they added.