MPs are debating the PM's Brexit deal, amid uncertainty about whether the decisive vote on it will go ahead.
The PM is trying to convince MPs to support the agreement he secured with the EU, in Parliament's first Saturday session in 37 years.
Mr Johnson told MPs "now is the time to get this thing done", saying any delay beyond 31 October would be "corrosive".
But MPs will debate a proposal that could delay Brexit again until all the necessary UK legislation is passed.
Commons Speaker John Bercow has chosen an amendment that, if passed, would require the PM to write to the EU by the end of the day to ask for a three-month extension to Brexit.
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