Boris Johnson is calling on MPs to back his plan to hold an early general election on 15 October.
The PM has laid a motion in the Commons to secure the poll. To succeed, it needs the support of two-thirds of MPs.
But Labour, the SNP and the Liberal Democrats have said they will not vote in favor.
It comes after MPs backed a bill to block a no-deal Brexit if the PM hasn’t agreed on a plan with the EU ahead of the 31 October deadline.
Mr Johnson dubbed it a “surrender bill” that would “cut his legs off” for negotiations on a new deal, minus the controversial backstop.
But the bill passed all its stages in the Commons in one day, with the support of most opposition parties and Tory rebels, as they tried to push it through ahead of Parliament being suspended next week.
It will now go to the Lords for approval.
Peers are currently debating a business motion on how to move forward with the bill on Thursday – but pro-Brexit MPs have laid down over 100 amendments to derail its progress.
The PM warned on Tuesday that he would return to the Commons with a motion for an election under the Fixed Term Parliaments Act if the bill got to this stage.
Speaking as he introduced the motion, Mr Johnson said the bill approved to block a no-deal “hands control to Brussels”, and “scuppers any serious negotiations”.
He said it would force him to “surrender”, adding: “I refuse to do this and it is clear there is only one way forward for the country.
“In my view and in the view of this government there must now be an election on Tuesday 15 October.”
