Philip Hammond is facing a growing Tory mutiny over defence spending . Conservative MPs plotting major rebellion during Commons debate . Debate will call for UK to honour commitment to spend at least 2 % of national income on defence - but Cameron has refused to guarantee pledge .
David Cameron is facing a growing Tory mutiny over defence spending . Conservative MPs plotting major rebellion during Commons debate . Debate will call for UK to honour commitment to spend at least 2 % of national income on defence - but Cameron has refused to guarantee pledge .