Boris Johnson will today warn that the Tories will 'kick the bucket' unless they deliver Brexit by Halloween - as he faces an all-out Remainer revolt to block No Deal.
Formally launching his leadership campaign, Mr Johnson will vow to stick to the October 31 deadline, saying 'delay means Corbyn'.
The former foreign secretary is hot favourite to win the race to take over from Theresa May in Downing Street, despite stinging attacks from rivals such as Jeremy Hunt and Michael Gove.
But the scale of the challenge Mr Johnson faces if he does triumph will be underlined within hours of his appearance this morning, when MPs stage a vote designed to kill off No Deal.
Speaker John Bercow has caused fury by bending parliamentary rules to allow a motion to be put down by Labour with cross-party support. It would seize control of Commons business from the government at the end of this month so a law can be passed banning the UK from crashing out of the EU without an agreement.
Boris Johnson (pictured arriving at his campaign launch today) has vowed to stick to the October 31 Brexit deadline, saying 'delay means Corbyn'
Ten MPs are on the ballot as Tory MPs prepare to vote on who will be their next leader
The move to wrest control of Parliamentary business from the Government has the backing of former Tory Cabinet minister Sir Oliver Letwin, as well as all the Liberal Democrats, SNP and Greens.
International Development Secretary Rory Stewart indicated he supported Parliament's efforts to block No Deal, but later said he would not vote for it after being warned he could face the sack.
The move follows an extraordinary decision by Mr Bercow to allow Labour to table a Commons business motion, which would normally be the preserve of the Government.
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This will be another critical day, as the first ballot takes place.
Anyone with fewer than 16 votes will be automatically eliminated, and at least one will be ejected.
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Further rounds of voting will take place during June until there are just two candidates left by this point.
They will then go to a run-off ballot of the 160,000 Tory members.
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The winner is due to be declared this week.
They will take over from Mrs May as PM shortly afterwards - probably in time to take a session of PMQs before the Commons breaks up for its summer recess.
Mr Johnson's status as frontrunner was boosted today as a poll predicted he could win a majority of 140 seats in a general election.
The ComRes research for the Telegraph identified him as the only candidate capable of besting both Jeremy Cobryn on the left and Nigel Farage on the right.
Ahead of the first round of voting by MPs tomorrow, Mr Johnson has nearly double the number of public pledges of support from colleague as rivals Mr Gove and Mr Hunt.
Mr Johnson is expected to say today that any further delay beyond the current Article 50 deadline of Halloween would mean 'defeat' for the Tories at the next election.
He will say that Brexit will never be delivered if MPs give the 'slightest hint that we want to go on kicking the can down the road' adding in his campaign launch speech: 'Delay means defeat.
'Delay means Corbyn. Kick the can and we kick the bucket.'
Mr Johnson will say his preferred solution is to negotiate a new Brexit deal with the EU, but the central plank of his campaign is that Britain will leave the EU by October 31 with or without a deal - something his critics say is not possible to guarantee.
But the launch today promises to be turbulent as it is the first time Mr Johnson has faced sustained questioning from reporters for months.
There were claims today that business leaders are deeply worried about the prospect of him getting the keys to Downing Street, after he jibed 'f*** business' when asked about their Brexit concerns at a meeting last year.
Mrs May warned the Cabinet yesterday that Parliament would never allow her successor to take Britain out of the EU without a deal.
During a fractious meeting of her top team, the outgoing Prime Minister said: 'There were as many people, if not more, on the Stop No Deal side as there were in the ERG [group of Eurosceptic Tory MPs] who would not support my deal. My successor is going to have the same problem.'
One senior Tory last accused Mr Bercow, who has spoken out against Brexit in the past, of 'constitutional vandalism'.
But his decision means MPs will be asked to vote on a Commons motion today which would give pro-Remain MPs control of the parliamentary timetable on June 25. Labour said MPs would then 'have the chance to introduce legislation that could help avoid the UK crashing out of the EU without a deal'.
The legislation is expected to focus on ruling out the option of suspending Parliament to push through No Deal, which has been floated by leadership contenders Dominic Raab and Esther McVey. But a Tory source involved in the move last night said further legislation would follow if any new PM tried to pursue a No Deal Brexit.
Former Cabinet minister Priti Patel was among the MP backers at Mr Johnson's campaign launch today
Ex-defence secretary Gavin WIlliamson (pictured) has been coordinating Mr Johnson's charm offensive in Parliament, and was at the launch today
Jeremy Hunt staged his own photocall with supporters in Westminster today as Mr Johnson held his launch
Tory grandee Oliver Letwin (l) and Labour shadow Brexit Secretary Kier Starmer are co-signatories of the motion which could deprive a future PM of the No Deal negotiating strategy
Commons Speaker John Bercow (pictured) has caused fury by allowing Labour to table a Commons business motion, which would normally be the preserve of the Government
The source said: 'We will start by ruling out proroguing Parliament but at a bigger level it is showing that Parliament will block No Deal.
'We are flexing
