- If they succeed, would Mr Johnson have to step down at that point? If there's enough support for Mr Corbyn's vote of no-confidence, Parliament could force the appointment of a new premier at the helm of a government of national unity, Mr Grieve said. 'Convention number one is that a PM does not or can not hold office without the consent of the House of Commons'.
It is believed this short-term government could gain the confidence of the Commons by urging the European Union to delay Brexit and then calling for a general election.
"Boris is talking a great talk and more power to him - I will cheer him on but he's got to deliver".
An EU source meanwhile told The Telegraph the "working hypothesis" in Brussels was "now no-deal".
It followed reports that senior European Union officials had concluded Boris Johnson's government has no intention of negotiating and that its "central scenario" was no-deal on 31 October.
However, if he did refuse to follow "constitutional precedent" it would spark a crisis that could drag the Queen into Brexit politics.
Mr Hancock's comments echo a warning reportedly made by the prime minister's senior adviser, Dominic Cummings, that MPs have left it too late to stop no deal. The motion would have granted MPs control of the parliamentary timetable in the autumn, enabling them to prevent no-deal.
BJP's Sushma Swaraj passes away at 67
A former Supreme Court lawyer, Swaraj was the senior most woman in Modi's cabinet in his first term, which ended in May. Celebrity Michelin Star chef Vikas Khanna tweeted, "Thank you for letting me cook for you on your every trip to NY".
What happens in a confidence vote?
Johnson could argue that he is not obliged to resign and decide to hold out until an election is triggered and then hold that election after October 31. However, when this proposition was put to Mr Cummings - the mastermind behind the Vote Leave campaign - he is said to have laughed.
One option is, as Corbyn suggested, a possible vote of no confidence in Johnson's new government.
He said: "I think any money for the health service is excellent news but the health service is a massive operation and even sums of billions of pounds don't make a lot of difference". But the Queen wants to stay out of politics, so she wouldn't want to do that'.
Speaking on a visit to Northern Ireland, Mr Varadkar repeated an invitation to Mr Johnson to go to Dublin for talks on the basis of "no preconditions".
He said: 'The answer is no.
He added: "As a result of this morning's announcement, frontline NHS providers will be able to spend £1 billion in 2019-20 on backlog maintenance and other capital spending that they weren't able to spend last week".
"There will be opportunities for us when parliament returns in September to stop no deal", Labour's Jon Ashworth told Sky News.
Last week's special election in the Welsh constituency of Brecon and Radnorshire showed the potential risk to the government of an early vote.