America's controversial new ambassador to the United Nations is threatening to torpedo 12 months of negotiations on the reform of the organisation. With only three weeks to go before world leaders arrive in New York to agree the deal, ambassador John Bolton has tabled at least 500 amendments. n a letter to fellow UN ambassadors, Mr Bolton said the 38-page document might have to be ditched altogether and replaced with a far less detailed alternative. The letter, which was leaked yesterday, asks other ambassadors to remain "open to alternative formats if they help us achieve consensus". Mr Bolton's intervention has...