The Prime Minister has said he would not seek to extend Brexit negotiations, even if legislation preventing no-deal becomes law.
He has already declined to rule out resigning if he fails to deliver Brexit by the current October 31 deadline leaving him little room for maneuver.
Boris Johnson was speaking in Scotland today ahead of the Prime Ministers traditional September visit to the Queen at her Balmoral residency.
On stepping down Mr Johnson said: That is not a hypothesis Im willing to contemplate. I want us to get this thing done.
MailOnline reports that when asked if he would seek an extension if it is set out in law Johnson said: I will not. I dont want a delay.
This rules out tearing up his do or die pledge to leave by October 31 and go to the EU bowl in hand to ask for a membership extension.
If the bill is passed, his insistance on not pushing back the Brexit deadline means he can either resign as PM, or knowingly break the law and spark a constitutional crisis.
The opposition backed Benn-Burt bill which makes a no-deal Brexit illegal without parliamentary approval is expected to be given formal Royal Ascent on Monday after passing through the House of Lords on Friday.
The legislation orders the Government to ask for a Brexit delay until January 31 next year, should no agreement be reached by October 19 and MPs not deciding to back a no-deal.
Equally it sets out that should the European Council offer an alternate extension it must be accepted by the PM within two days unless the Commons rejects it.
Boris Johnson had said he favoured going to the polls on October 15, but failed to secure a two-thirds majority in the Commons to get one this week.
Opposition parties, not trusting him stick to that date, are expected to reject his plea again when a second vote is held on Monday.
Opposition parties feel they have the PM on the ropes but could make him cling to power throughout October in order to force him to make the bitter choice or stand down.
Plaid Cymrus Westminster leader Liz Saville Roberts told the BBC: We were in unity in our opinion, our priority is of course to stop a No Deal Brexit.
In the short time we need to make sure that we get past the 31st October and an extension to Article 50.
Now in that respect we were in agreement that the Prime Minister is on the run. Boris is broken.