Boris Johnson has been forced to cut short his trip to the US in the wake of a humiliating Supreme Court ruling which declared his decision to suspend parliament unlawful.

Responding to the explosive decision for the first time, the PM told reporters in New York that he “strongly disagrees” with the verdict but said parliament “will come back”.

The prime minister also said his “preference” was for parliament to be prorogued again so a Queen’s Speech could be held.

A second suspension is not expected imminently, after the ruling left Mr Johnson’s Brexit plans in ruins.

In a pooled interview in New York, the PM said: “Obviously this is a verdict that we will respect and we respect the judicial process.

Supreme Court verdict: Boris Johnson prorogation unlawful Show all 16 1 /16 Supreme Court verdict: Boris Johnson prorogation unlawful Supreme Court verdict: Boris Johnson prorogation unlawful The Supreme Court has ruled against Boris Johnson by declaring his government unlawfully shut down parliament for five weeks EPA Supreme Court verdict: Boris Johnson prorogation unlawful Lady Hale handed down the historic verdict, hailed by opposition MPs and anti-Brexit campaigners. She said all 11 judges were unanimous in deciding that the case is “justiciable”, so the government loses that part of the argument. “The court is bound to conclude therefore that the decision to advise Her Majesty to prorogue was unlawful because it had the effect of frustrating or preventing the ability of Parliament to carry out its constitutional functions.” EPA/Supreme Court Supreme Court verdict: Boris Johnson prorogation unlawful Gina Miller and her team react outside the Supreme Court are the verdict. She said: “Today is not a win for any individual or cause. It is a win for Parliamentary sovereignty, the separation of powers and independence of our British courts. Crucially, today’s ruling confirms that we are a nation governed by the rule of law, laws that everyone, even the Prime Minister, are subject to." PA Supreme Court verdict: Boris Johnson prorogation unlawful A person dressed as a caricature of British Prime Minister Boris Johnson in a prison uniform stands outside the Supreme Court AP Supreme Court verdict: Boris Johnson prorogation unlawful Labour leader Jeremy Corbyn called for Mr Johnson to “consider his position” following the landmark decision, while Lib Dem leader Jo Swinson said he was “not fit to be prime minister” Getty Supreme Court verdict: Boris Johnson prorogation unlawful Scottish National Party (SNP) Westminster leader Ian Blackford raises his arms as he comes outside. He said: "This is an absolutely stunning judgement by the Supreme Court today." He went on to say, "we all want to get back to work, and quite frankly, on the back of this, Boris Johnson must resign immediately." AFP/Getty Supreme Court verdict: Boris Johnson prorogation unlawful Crowds outside celebrated the verdict AP Supreme Court verdict: Boris Johnson prorogation unlawful Delegates at the Labour party conference applaud after hearing the news AFP/Getty Supreme Court verdict: Boris Johnson prorogation unlawful Speaker John Bercow said MPs must now “convene without delay” and confirmed the Commons would return at 11.30am on Wednesday AFP/Getty Supreme Court verdict: Boris Johnson prorogation unlawful Gina Miller said: "“As a result of this judgment, Parliament is open, it was never prorogued. I urge MPs to get back to work immediately.” AP Supreme Court verdict: Boris Johnson prorogation unlawful MPs Anna Soubry, Liz Saville Roberts and Caroline Lucas, together with SNP leader Ian Blackford, react. Green MP Caroline Lucas has said the Supreme Court’s decision is “just the start” Reuters Supreme Court verdict: Boris Johnson prorogation unlawful “The UK deserves a Prime Minister and a Government who act with honesty, integrity and in a manner consistent with our constitution, at all times." AFP/Getty Supreme Court verdict: Boris Johnson prorogation unlawful Anti-Brexit supporters react as they gather outside the Supreme Court in London, Tuesday, Sept. 24, 2019 as it makes it's decision on the legality of Prime Minister Boris Johnson's five-week suspension of Parliament. (AP Photo/Frank Augstein) Frank Augstein AP Supreme Court verdict: Boris Johnson prorogation unlawful The SNP’s Joanna Cherry QC says: “Boris Johnson’s position is untenable and he should have the guts to resign.” PA Supreme Court verdict: Boris Johnson prorogation unlawful epa07865617 Protesters react outside the Supreme Court after the result of a hearing on the prorogation of parliament, in London, Britain, 19 September 2019. The Supreme Court ruled that the suspension of parliament by British Prime Minister Boris Johnson was not lawful. EPA/NEIL HALL NEIL HALL EPA Supreme Court verdict: Boris Johnson prorogation unlawful Tom Tugendhat MP returned to the chamber in the House of Commons within minutes of the Supreme Court ruling PA

“I have to say that I strongly disagree with what the justices have found. I don’t think that it’s right but we will go ahead and of course parliament will come back.

“I do think there’s a good case for getting on with a queen’s speech anyway and we will do that.”

Mr Johnson also criticised the Supreme Court, saying: “To be honest, it is not made much easier by this kind of stuff in parliament or in the courts​.”

His claim appeared to be a contradiction of his own legal team’s argument in court, which rested on the claim that parliament’s suspension was unrelated to Brexit.

A UK government source told The Independent that the leader would be returning to London sooner than planned, although he will still give a speech as scheduled to the United Nations this evening.

“We will be flying back overnight to the UK after the PM’s speech to the UN this evening.” the source said.

The prime minister had been due to catch a flight back in the morning, following an appearance at the UN General Assembly.

Instead he is expected to return to London by around 11am on Wednesday.

Despite mounting pressure on his premiership a Downing Street source said Mr Johnson will not resign in the wake of the Supreme Court judgment.

Support free-thinking journalism and attend Independent events

The No 10 source said: “The PM will not resign following the judgment.“

“Following the PM giving his speech at the UN this evening he will be flying back overnight to the UK and there will be a Cabinet call today while the PM is in New York.”

Mr Johnson attempted to strike a defiant tone while talking to journalists in New York after the court’s ruling was delivered.

“As the law currently stands, the UK leaves the EU on 31 October come what may but the exciting thing for us now is to get a good deal – and that is what we are working on,” he said.

Jeremy Corbyn, the Labour leader, called on Mr Johnson to “consider his position”.

The call was echoed by Ian Blackford, the SNP leader in Westminster, who called for the prime minister’s resignation.

Jo Swinson, the Liberal Democrat leader, said Mr Johnson had “again proven he is not fit to be prime minister.”

John Major, a former Conservative prime minister, called on the country’s leader to apologise to parliament for his actions.

“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,” he said.

“I hope this ruling from the Supreme Court will deter any future prime minister from attempting to shut down parliament, with the effect of stifling proper scrutiny and debate, when its sitting is so plainly in the national interest.”

Former attorney general Dominic Grieve, the co-chair of the People’s Vote Political Committee, said Mr Johnson will now face intense pressure for a second EU referendum, pitting Theresa May's deal against Remain.

Mr Grieve said: “Today’s ruling by the Supreme Court shows that the Prime Minister’s undemocratic attempts to ram his plans for No Deal through are continuing to fail. But the crisis in our democracy has not been ended by this decision. Instead, it gives all of us an opportunity to pull our country back from the dangerous cliff-edge where Boris Johnson’s reckless and relentless pursuit of the hardest possible form of Brexit has taken us.

“I believe the penny has dropped for a growing number of MPs that the only legitimate way of solving this crisis is to allow the people to decide, now that we know so much more about what Brexit would mean, whether we want to go ahead with it or not. There is a growing recognition on all sides that a general election is no way of settling this question and, indeed, could end up being divisive without being decisive with it quite likely to result merely in another hung parliament

“It is entirely possible for MPs to decide now to have a confirmatory referendum on Theresa May’s deal - or some other version of it - which can take place before an election. This could take place within five or six months and be binding on all participants. It would give us the clarity we all need to move on from the Brexit crisis and then have an election where all the other issues facing our country could be properly debated.”