It is difficult to articulate how unprecedented the UK’s Supreme Court’s ruling is.
Britain’s highest court was established a decade ago next week. Its has been dragged into the gravitational pull of the Brexit saga before – notably when it decided Parliament must get a vote on a Brexit deal, a decision that ultimately doomed Theresa May’s attempts to leave the European Union and finally sunk her premiership.
But it has never faced a case of this magnitude, nor one which drew so much attention.
And its newest judgement could spell more immediate doom for May’s successor, given that it explicitly found that his own actions were unlawful.
That’s the view emanating from Parliament’s opposition parties, who reacted with a tsunami of attacks on Johnson.
“The Prime Minister must resign to make way for an emergency Government that can stop a No Deal Brexit,” Jo Swinson, the leader of the surging anti-Brexit Liberal Democrats, said after the judgement.
“Boris Johnson has no regard for the law … yet again he has been found out,” Labour’s shadow Brexit secretary added on Twitter. “The sooner we resume our work challenging and defeating him the better.”
And Amber Rudd, who quit Johnson’s cabinet earlier this month in protest at his Brexit strategy, said that “despite personal assurances from the PM, the Cabinet was not shown the legal advice around this prorogation.”
“This is an astonishing moment and I regret that the PM, who entered office with such goodwill, went down this route,” she added.
The Prime Minister has predictably ignored those calls for his resignation. But now that the furious lawmakers are returning to work, they could be plotting to join forces for a vote of no confidence that could force an election would give Johnson the ignominy of becoming the UK’s shortest-serving prime minister.