Tory leadership rivals have clashed in a live BBC TV debate on whether the UK can leave the EU, no matter what, by the 31 October deadline.
Asked for a guarantee he would do this, Boris Johnson described the deadline as "eminently feasible".
Sajid Javid said it "focused minds", but Michael Gove and Jeremy Hunt said extra time might be needed.
Rory Stewart accused his colleagues of lacking realism - of "staring at the wall and saying 'believe in Britain'".
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