The Prime Minister David Cameron said the next election will be a straight fight between red and blue.
Speaking to ITV News earlier he defended his government's welfare reforms, pledged to promote more women to his front bench, and responded to his description of UKIP voters as "closet racists, loonies and fruitcakes."
Watch his full interview with ITV News presenter Julie Etchingham below.
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Sir John rejected the PM's Brexit vision as "unreal and over-optimistic" as he accused negotiators of "souring" the atmosphere for talks.
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White House budget officials outlined the information during a telephone call with reporters given on condition of anonymity.