By James Tapsfield, Political Editor, For Mailonline
Published: 08:47 BST, 16 June 2019 | Updated: 08:48 BST, 16 June 2019
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Tory Brexiteers have warned Boris Johnson they will quit if he reneges on his solemn vow to take Britain out of the EU by Halloween.
Senior Eurosceptics insisted the Conservatives would be 'over' and they would defect to the Brexit Party unless the leadership front runner follows through.
Mr Johnson is the runaway favourite to take over from Theresa May after promising Brexit will happen by October 31 - with or without a deal.
Mr Johnson's main rivals have warned it is not possible to force No Deal through parliament, and there is not enough time to overhaul the package thrashed out with Brussels.
Mr Johnson fuelled rumours of an early ballot by telling a hustings event he would 'get Brexit done and get ready for an election. He is pictured arriving at the event in London yesterday
He raised eyebrows on Friday by suggesting that there was no question of extending the deadline 'at this