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A ruling on whether the government acted lawfully when it suspended parliament for five weeks is expected tomorrow.
Supreme Court judges will rule on separate appeals brought by two groups who claimed the Prime Minister acted outside the scope of what is termed the prorogation of parliament.
Boris Johnson denied lying to the Queen about his reasons for suspending parliament when he sought her permission.
Businesswoman Gina Miller appealed to the High Court in England about the decision but had her case dismissed.
Meanwhile, judges in Scotland upheld a case brought by remain campaigners that the prorogation was designed to stop MPs from scrutinising Brexit plans.
That decision was appealed by the government, with its lawyers arguing that it was a political matter, and therefore not something the courts can rule on.
The decision tomorrow could have far-reaching consequences.
It has led to speculation that opposition parties will call for a recall of Parliament if the judges rule that the Prime Minister acted incorrectly.
The ruling is expected tomorrow morning.