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Commons leader Andrea Leadsom has questioned Speaker John Bercow's impartiality over Brexit.

It followed his criticism of the government's decision to cancel Tuesday's crunch vote on Brexit.

Mr Bercow said that doing so would be "deeply discourteous" to MPs.

Mrs Leadsom told BBC Radio 4's Today: "He's made his views on Brexit on the record, and the problem with that of course is that the chair's impartiality is absolutely essential."

She was asked whether she believed Mr Bercow's position - chairing debates in the House of Commons - was "tainted", she replied: "He's made his views known on Brexit... it's a matter for him but nevertheless it's a challenge and all colleagues need to form their own view of that."