But he has signalled he has no plans to meet that original deadline, previously defiantly underlining to MPs that none of them objected when he was re-elected to the post after last year’s snap general election.
Conservative MP James Duddridge, one of his fiercest critics, said: “Speaker Bercow will be breaking a manifesto commitment if he does not resign today.
“He will lack credibility and any honour.
“He has diminished the role and his authority in ignoring his promise to only serve nine years.
“How can we ever trust Speaker Bercow again?
“He is a diminutive Speaker in a diminished role.”
Mr Bercow’s wife, Sally, who lives with him and their children in the Speaker’s official Parliamentary residence, has been using Twitter to mock calls for him to quit, saying in one message earlier this week: “On Friday, I look forward to a school visit, lunch with a friend, son’s football tournament and my mum coming to stay for the weekend. I haven’t started packing yet. Sorry to disappoint.”
It has been claimed that Remain-voting Mr Bercow wants to stay on at least until next year to ensure the Government does not have an inexperienced new Speaker to railroad over Brexit legislation.
Some friends have urged him to name a departure date on grounds that “time is up”, amid growing campaigning by potential successors for the prestigious role.
He has been accused of bullying staff but denies the allegations.
Earlier this week, a spokeswoman for the Speaker’s Office said: “He was elected by the House in 2017 for the course of the Parliament. In the event he has anything to say on his future plans, he will make an announcement to the House first.”
Tory MP Andrew Bridgen, who also wants Mr Bercow gone, said: “He promised to serve two terms or a maximum of nine years as Speaker. His nine years are up and he should honour his promise and stand down. If he continues, discontent will increase.”
Sources close to the Speaker confirmed last night he had no plans to resign.