Boris Johnson is facing calls to resign after the Supreme Court ruled unanimously that his five week suspension of parliament was unlawful.
They ruled that the government had not provided a justifiable reason for proroguing parliament, particularly for as long as five weeks, and ruled that in effect the prorogation never happened.
The prime minister was at the United Nations General Assembly in New York while the verdict was given but has since flown back to the UK as parliament has resumed sitting in the House of Commons today.
There have been calls for Johnson to resign over being judged to have acted unlawfully, but will he actually go?
The Claim
Johnson had previously said he wouldn't resign in the event of the Supreme Court ruling against him, for the time being it looks as though he will attempt to stay in Downing Street.
He insisted his position wouldn't be untenable, arguing that he had good reasons to prorogue parliament and open a new session with a Queen's Speech and new domestic agenda.
The prime minister said he very much disagreed with the ruling of the Supreme Court but would respect the outcome.
The official line from No 10 is that the prime minister won't be resigning and is still focused on getting the UK out of the EU on October 31, but leader of the House of Commons Jacob Rees-Mogg called the Supreme Court ruling a "constitutional coup".
Others in Downing Street said the Supreme Court judges had made a "serious mistake", with cabinet minister Michael Gove insisting there is a "respectable legal opinion" that disagrees with the ruling they have made.
The Counter Claim
The Financial Times takes the view that the prime minister's unlawful conduct ought to lead to his resignation.
They praised the Supreme Court judges for seeing through "Downing Street's skulduggery" and say the ruling on Johnson acting unlawfully "leaves a stain on his character and competence".
For a prime minister to be found to have acted unlawfully by the highest legal authority in the UK is a damning condemnation of their conduct in the highest public office, the FT believes "any premier with a shred of respect for British democracy and the responsibilities of his office would resign".
Calls for Johnson to resign are being led by Jeremy Corbyn, the leader of the opposition. He said the prime minister "should now resign" after being found to have acted unlawfully.
The prime minister being found to have acted unlawfully is unprecedented in modern British politics. It is hard to see how Johnson can stay in Downing Street much longer with no majority, no mandate and a unanimous Supreme Court ruling determining that he acted unlawfully.
The Facts
Parliament has now returned to sit in the House of Commons. Since the prorogation was ruled to be unlawful and essentially didn't happen the record shows that parliament was adjourned for the period of suspension.
If MPs really want Johnson to resign then they could attempt to call a motion of no confidence in him, as he would be obliged to resign if defeated.
That would likely lead to a general election, something the prime minister would like before the October 31 deadline if he can help it.
Johnson has spoken to the Queen since the Supreme Court ruling, though it is not known whether he apologised for giving her advice found to have been unlawful.
If he does resign soon it would leave him as the shortest serving prime minister in British history, though one who would make as much history as many predecessors with a much longer time in office.
Johnson would need to stay in Downing Street until November 20 to avoid this ignominious accolade, having served just 63 days in office.
