“…Again, the reaction has been to augment, refine, adjust and revisit the ideas of just cause, legitimate authority, right intention, proportionality, non-combatant immunity and so on. Ideas such as preventive war 11 and the notion of 'illegal combatants' as a new, ethically laden, category into which transnational terrorists fall, 12 16 Feinstein and Slaughter also deploy notions of just cause, proportionality, legitimate authority, right intention and last resort from Just War's lexicon. 17 Buchanan and Keohane's influential defence of preventive war also utilises Just War criteria and extends this line of ethical reasoning.…”