John Bercow has warned Boris Johnson against disobeying the law by not asking for a Brexit delay
It comes after the prime minister denied lying to the Queen over the suspension of parliament, insisting such claims were “absolutely not” true.
Earlier on Thursday, Scotland’s first minister Nicola Sturgeon claimed the title of the Yellowhammer document, seen by her Holyrood government, was changed before its release by Downing Street on Wednesday night.
Mr Johnson is under renewed pressure to reopen parliament after the dossier revealed the “unprecedented” scale of the problems the nation could face in the event of a no-deal Brexit.

Boris Johnson avoids MP questions about misleading Queen to appear on Facebook
Prime minister was due to face up to two and a half hours of MPs' questions if parliament had not been suspended
Official no-deal Brexit document confirms government planning for delays, disruption and disorder
Operation Yellowhammer report forced out of government by MPs confirms leaks which ministers had dismissed as outdated
Government ignores order to release key Brexit documents and internal messages
Ministers condemn 'unprecedented, inappropriate, and disproportionate' request and claim that releasing advisers' messages on decision to suspend parliament would be illegal
Fury as Tory Cabinet minister claims 'many people' believe judges are biased over Brexit after prorogation ruling
'Many people up and down the country, are beginning to question the partiality of judges'
Home Office making hostile environment for EU citizens worse, European Parliament warns
EU legislature demands review and replacement of settlement scheme