Foreign Secretary William Hague has told ITV News Political Editor Tom Bradby that Iraq faces a "severe challenge to its existence as a state" and the current conflict will be a "decisive moment in its history."
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Ed Miliband has said he is willing to take part in a TV debate with David Cameron 'anytime, any place, anywhere'.
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ITV News has obtained a video statement made by a former Royal Marine who was later killed fighting against Islamic State in Syria.