How do we decide what is in the national interest?

David Cameron recently described Jeremy Corbyn’s support for nuclear disarmament as a threat to national security. During his premiership, Gordon Brown argued for sweeping reforms to tackle global challenges such as climate change, poverty and the failing banking system, all in the name of ‘the national interest’. But how should we evaluate such political rhetoric? Adam Humphreys highlights the distinction between reformist and conservative reasoning in deciding what a nation really needs.