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Conservative MP Andrew Bridgen has told 5 live's Pienaar's Politics programme that David Cameron's strategy of "Project Fear" over a brexit is angering MPs, and could lead to the Prime Minister being ousted.

It comes as Michael Gove and Boris Johnson from the leave campaign published an open letter, trying to get the Prime Minister to admit that his manifesto pledge to control migration is impossible, because of free movement rules within the EU.

The letter could deepen splits in the party and make it ungovernable, unless there's a decisive victory for the remain campaign.