'Boris Johnson today faced an extraordinary bid by a senior Tory to oust him before he even becomes PM.
Sir Alan Duncan - a long-time foe of Mr Johnson who was once his deputy at the Foreign Office - announced his resignation on the eve of the new Conservative leader being installed.
And he immediately tabled an emergency motion to force a Commons vote on whether Mr Johnson had the right to form a government.
The explosive tactic was seemingly designed to expose Mr Johnson's wafer-thin majority and stop him ever taking office, despite Sir Alan saying he would have supported the new Tory leader. However, it was blocked by the Speaker as breaking Parliamentary procedure.
It underlines the mammoth task facing the new premier to hold the Tories together amid furious infighting over Brexit.
One Tory MP told MailOnline the idea pushed by Sir Alan was 'bonkers' and showed that he was 'dripping in arrogance'.
Sir Alan's departure this morning immediately sparked claims that a slew of ministers will follow him out of the door as Theresa May's premiership enters its final 48 hours.
Chancellor Philip Hammond and Justice Secretary David Gauke have already made clear they will quit on Wednesday before Mrs May formally stands down. Health minister Stephen Hammond and defence minister Tobias Ellwood are also believed to be among those considering their positions.
Meanwhile, former PMs Tony Blair, Gordon Brown and John Major have all heaped pressure on Mr Johnson by warning him against No Deal, saying he must not represent an 'ultra-Brexit faction'.'
Read more: Sir Alan Duncan launches astonishing bid to take out Boris BEFORE he becomes PM: Minister quits and calls for vote TOMORROW on whether Johnson has the right to be in No10
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