Boris Johnson has insisted claims he lied to the Queen in order to suspend Parliament were “absolutely not” true.
His comments come after Scotland's highest civil court ruled that the suspension was "unlawful", overturning a previous ruling made at the same court by Judge Lord Doherty.
He ruled that whether or not to prorogue Parliament was for politicians, not the courts, to decide.
However, a panel of three Court of Session judges claimed yesterday that the move had the "purpose of stymying Parliament".
Mr Johnson insists he prorogued Parliament to set out his domestic agenda, and not to push through a no-deal Brexit unchallenged, as some MPs had suggested.
Asked whether he had lied to the Queen about his reasons to suspend sitting, he said: "Absolutely not.
"The High Court in England plainly agrees with us but the Supreme Court will have to decide.We need a Queen's Speech, we need to get on and do all sorts of things at a national level."
The action to challenge the prorogation was brought before the court by a cross-party group of around 70 parliamentarians.
Among them was SNP MP Joanna Cherry QC, who wrote in a column for The Times she was "proud" the Scottish courts were reminding Mr Johnson "he is not above the law".
The ruling will not immediately affect the current suspension of Parliament, which began on Tuesday and ends on October 14.
The government plans to appeal against it, and a full hearing is scheduled at the Supreme Court on September 17.