The justice secretary has refused to rule out Boris Johnson shutting down parliament a second time and suggested the Queen’s Speech may not go ahead next month.

Robert Buckland said the opening of the new parliamentary session – announced for 14 October and the stated reason for the five-week suspension – would take place “if we are able to”.

And, asked if it was “remotely conceivable” that a second prorogation would be ordered – if the Supreme Court forces a recall of parliament – said the political situation was simply too volatile to make predictions.

“For me to sit here and imagine what might happen at end of October, I think, is idle,” Mr Buckland said.

“What I do know is that, if we are able to, we will have a Queen’s Speech in mid-October.”

When Dominic Cummings, last week, floated the possibility of a second suspension, if the Supreme Court rules the first was illegal, the comment was dismissed by Downing Street as “a joke”.

Protesters take to streets after Boris Johnson suspends parliament Show all 11 1 /11 Protesters take to streets after Boris Johnson suspends parliament Protesters take to streets after Boris Johnson suspends parliament Anti Brexit protesters march on Whitehall EPA Protesters take to streets after Boris Johnson suspends parliament Many of the protesters carried placards AP Protesters take to streets after Boris Johnson suspends parliament A demonstrator wears a Boris Johnson mask during a London rally AFP/Getty Images Protesters take to streets after Boris Johnson suspends parliament An anti-Brexit demonstrator wields an EU flag during a London rally. AFP/Getty Images Protesters take to streets after Boris Johnson suspends parliament The protesters also marched to Trafalgar Square, where they blocked traffic AP Protesters take to streets after Boris Johnson suspends parliament John McDonnell addressed crowds in Whitehall. PA Protesters take to streets after Boris Johnson suspends parliament A small group of Brexit supporters attempted to stage a counter protest in central London. AP Protesters take to streets after Boris Johnson suspends parliament Three people were arrested in London, including a woman who sat on the road near Trafalgar Square. AP Protesters take to streets after Boris Johnson suspends parliament In Oxford, locals and students gathered outside Balliol College, Boris Johnson's alma mater, to protest. PA Protesters take to streets after Boris Johnson suspends parliament Thousands of people gather in central Glasgow to protest against the prime minister. AFP/Getty Images Protesters take to streets after Boris Johnson suspends parliament Jeremy Corbyn spoke to protesters in central Glasgow. Getty

But Mr Buckland, and the prime minister himself in a separate interview, suggested it is among the options being considered if the highest court in the land rules against the government.

Both also refused to commit to recalling parliament if the Supreme Court battle is lost, the justice secretary saying he would await “the precise wording of any judgement”.

Labour condemned the idea that the government might “ignore a court judgement and prorogue parliament all over again”.

“Any normal prime minister, faced with a ruling of that kind, would immediately go back to the Queen and ask for parliament to be recalled, said Shami Chakrabarti, the shadow attorney general.

“This is pretty scary stuff that is testing our constitution and our normal British sense of fair play to the limit.”

Mr Buckland, when speaking to BBC Radio 4’s Today programme, did not explain the threat to the Queen’s Speech, planned for the day MPs finally return to Westminster.

However, lawyers have suggested the Supreme Court, if it decides against the government might rule that the prorogation is “a nullity’.

That would mean that, in the eyes of the law, it never happened and parliament would pick up where it left off in July, with no new session and no Queen’s Speech.

Alternatively, the 11 justices could order the government to bring back parliament immediately, which could mean an earlier Queen’s Speech.

The case is expected to run for three days, including – extraordinarily – an appearance by John Major on Thursday, setting out why he believes Mr Johnson has broken the law.