His aides had already warned that defeat would force him to call a snap election ahead of a crucial EU summit on October 17-18 - and a mere fortnight before Brexit
Prime Minister Boris Johnson yesterday lost his working majority in parliament ahead of a showdown with rebel MPs over Brexit that could lead to a snap election within weeks.
Johnson condemned a plan by lawmakers to block his Brexit strategy as "surrender" and said it would undermine his intention to negotiate a new divorce deal with the EU.
He said the move by opposition MPs and members of his Conservative party to try to delay Brexit beyond October 31 if he cannot agree exit terms with Brussels was like "running up the white flag."
Ahead of the first vote in the House of Commons, scheduled for the early morning today, Johnson said: "There are no circumstances in which I will ever accept anything like it."
His aides had already warned that defeat would force him to call a snap election ahead of a crucial EU summit on October 17-18 - and a mere fortnight before Brexit.
The rebels believe they have the numbers to force through the plan, which is backed by the main opposition Labour party and could delay Brexit to January 31.
In a theatrical show of defiance, Conservative MP Phillip Lee crossed the floor of the Commons while Johnson was making his statement, to defect to the pro-European Liberal Democrats.
As a result, the prime minister no longer has a majority in the 650-seat chamber - but the defection does not automatically bring down the government.
This can only happen if the government loses a formal confidence vote.
Johnson took office less than six weeks ago, after his predecessor Theresa May was forced out over her failure to get her Brexit divorce deal through parliament.
From the start, he faced opposition from his own MPs who fear his threat of leaving the EU without an agreement with Brussels risks severe economic disruption.
Former finance minister Philip Hammond is among those who have joined with Labour to draw up legislation that could force the delay.
They will first try to make room in the parliamentary agenda for a debate of the bill by putting forward a motion set to be voted on by MPs on Tuesday evening.
If they succeed, they will introduce their bill on Wednesday and seek to get it through before parliament is suspended next week.