PM Boris Johnson's decision to suspend parliament less than two months before Britain is due to leave the EU was unlawful, a Scottish court rules.
British Prime Minister Boris Johnson suffered a fresh blow on Wednesday when a Scottish court ruled that his controversial decision to suspend parliament in the run-up to Brexit was unlawful.
The government immediately appealed, with the case set to be heard in the Supreme Court on Tuesday, and parliament set to remain shut in the meantime.
After the legal ruling, the opposition Labour party demanded that Johnson urgently recall parliament, which was suspended for five weeks on Tuesday.
However, a government source told AFP that "nothing is changing" until the case was concluded.
Johnson says the decision to suspend or prorogue parliament until October 14 is a routine move allowing his government to launch a new legislative agenda.
But critics accuse him of trying to silence parliamentary opposition to his threat to leave the European Union on October 31 even if he has failed to agree divorce terms with Brussels.
If Johnson fails to secure a deal he insists the country will leave anyway, to the outrage of many MPs who believe a "no-deal" exit would bring huge disruption.
The case, brought by 78 British lawmakers, was rejected by a Scottish lower court last week but was overturned on Wednesday by the Inner House, Scotland's supreme civil court.
It found that Johnson's advice to Queen Elizabeth II to prorogue parliament "was unlawful because it had the purpose of stymying parliament," a summary judgement said.
A British government spokesman said, "We are disappointed by today's decision, and will appeal to the UK Supreme Court.
"The UK government needs to bring forward a strong domestic legislative agenda. Proroguing parliament is the legal and necessary way of delivering this."
He noted a separate legal challenge to prorogation brought at the High Court in London last week had failed.
Today’s Court of Session judgment is of huge constitutional significance - but the immediate political implications are clear. Court says prorogation was unlawful and null and void - so Parliament must be recalled immediately to allow the essential work of scrutiny to continue.— Nicola Sturgeon (@NicolaSturgeon) September 11, 2019
Labour's Brexit spokesman Keir Starmer welcomed the ruling, saying, "No one in their right mind believed Boris Johnson's reason for shutting down parliament.
"I urge the prime minister to immediately recall parliament so we can debate this judgement and decide what happens next."
Scotland's first minister, Scottish National Party (SNP) leader Nicola Sturgeon, echoed his call.
"The immediate political implications are clear...parliament must be recalled immediately to allow the essential work of scrutiny to continue," she tweeted.
The summary judgment said the court would make an order declaring that Johnson's advice to the queen and the subsequent prorogation was "null and of no effect."
However, the government source said there would be no order issued ahead of next week's appeal.
Legal commentator David Allen Green suggested that the case was likely to fail when it reached the Supreme Court, pointing out that Scottish law was different from that of England and Wales.
"That is why I and others would have put the chances of the action succeeding in London as zero. And that is why cannily the action was launched in Scotland, where judges and the law would be far more receptive," he tweeted.