Protesters could be heard shouting ‘stop the coup’ at the beginning of Boris Johnson’s speech.

The prime minister will seek to hold a general election on 14 October if Parliament votes to hand control of the legislative timetable to the opposition on Tuesday, a government source said. Boris Johnson claimed Brussels would not engage until the possibility of legislation blocking a no-deal Brexit or a reversal of the whole process was removed and called for MPs to back him.

He sought to ramp up the pressure on those Tory MPs minded not to do so as the Commons prepares to debate legislation designed to prevent a no-deal Brexit. MPs were left in no doubt that Tuesday’s vote would be treated as a confidence vote by No 10 and the consequences for voting against Downing Street would be withdrawal of the whip. The work and pensions secretary, Amber Rudd, was one of those who urged Johnson not to go down that road.

In an address outside Downing Street, Johnson indicated he would refuse to ask Brussels for a delay to Brexit, even if a law was passed requiring him to do so. Johnson said there were “no circumstances in which I will ask Brussels to delay. We are leaving on 31 October - no ifs or buts”. That was despite plans to vote tomorrow on whether or not to legally bind him to such a course of action, should he fail to convince Parliament to back either a withdrawal agreement or a no-deal Brexit. Ministers have previously refused to rule out the government ignoring the rule of law on the issue.

The Labour leader, Jeremy Corbyn, insisted he would be ready for a general election. Earlier in the day, he had said he would back calling an early vote in any circumstances. However, Jenny Chapman – a shadow Brexit minister – later said Labour would not support a vote that took place after a no-deal Brexit on 31 October. The SNP leader, Nicola Sturgeon, committed her party to backing any vote before that date too.

The former chancellor, Philip Hammond, challenged the prime minister to set out details of his plan to negotiate an alternative to the backstop. There have been reports that, despite Johnson claiming to have made progress, officials on the continent believe little or nothing has been achieved. The Irish prime minister, Leo Varadkar, also said British proposals were not satisfactory.

Here is the full text of Boris Johnson’s statement.

Five weeks ago I spoke to you from these steps and said that this government was not going to hang around and that we would not wait until Brexit day - October 31 - to deliver on the priorities of the British people.

And so I am proud to say that on Wednesday Chancellor Sajid Javid is going to set out the most ambitious spending round for more than a decade.

I said I wanted to make your streets safer – and that is why we are recruiting another 20,000 police officers.

I said I wanted to improve your hospital and reduce the waiting times at your GP.

And so we are doing 20 new hospital upgrades in addition to the extra £34bn going into the NHS.

And I said I wanted every child in this country to have a superb education and that’s why I announced last week that we are levelling up funding across the country and spending much more next year in both primary and secondary schools.

And it is to push forward this agenda on these and many other fronts that we need a Queen’s speech in October.

While leaving due time to debate Brexit and other matters.

And as we come to that Brexit deadline I am encouraged by the progress we are making.

In the last few weeks the chances of a deal have been rising, I believe, for three reasons. They can see that we want a deal.

They can see that we have a clear vision for our future relationship with the EU - something that has perhaps not always been the case.

And they can see that we are utterly determined to strengthen our position by getting ready to come out regardless, come what may.

But if there is one thing that can hold us back in these talks it is the sense in Brussels that MPs may find some way to cancel the referendum.

Or that tomorrow MPs will vote – with Jeremy Corbyn – for yet another pointless delay. I don’t think they will. I hope that they won’t.

But if they do they will plainly chop the legs out from under the UK position and make any further negotiation absolutely impossible.

And so I say, to show our friends in Brussels that we are united in our purpose, MPs should vote with the government against Corbyn’s pointless delay.

I want everybody to know – there are no circumstances in which I will ask Brussels to delay. We are leaving on 31 October, no ifs or buts.

We will not accept any attempt to go back on our promises or scrub that referendum.

Armed and fortified with that conviction I believe we will get a deal at that crucial summit in October

A deal that parliament will certainly be able to scrutinise.

And in the meantime let our negotiators get on with their work Without that sword of Damocles over their necks.

And without an election, which I don’t want and you don’t want.

Let us get on with the people’s agenda – fighting crime, improving the NHS, boosting schools, cutting the cost of living, and unlocking talent and opportunity across the entire United Kingdom.

With infrastructure education and technology It is a massive agenda. Let’s come together and get it done – and let’s get Brexit done by 31 October.