The court said it was wrong to stop Parliament carrying out its duties, adding: “The effect on the fundamentals of our democracy was extreme,” the BBC reported.
Johnson suspended Parliament for five weeks earlier this month, saying it was to allow a Queen’s Speech to outline his new Brexit policies.
Now, Boris Johnson’s opponents lined up to call on him to resign and become the “shortest-serving prime minister ever.
“I invite Boris Johnson, in the historic words, to ‘consider his position’ and become the shortest prime minister there’s ever been,” he told delegates at the Labour Party’s annual conference in Brighton.
The Scottish National Party member of Parliament Joanna Cherry, who helped bring the case against Johnson said that the prime minister should now “do the decent thing and resign”
The prime minister, who is currently in New York meeting world leaders at UN General Assembly, is yet to issue a statement on the verdict.