Under Article 352, the President can proclaim a National Emergency on grounds of war, external aggression, or:

Article 352 grounds evolution: (a) Original text (1950): War, external aggression, or internal disturbance, (b) 44th Amendment (1978): Replaced 'internal disturbance' with 'armed rebellion' to prevent misuse like 1975 Emergency, (c) Current grounds: (i) War: Declared conflict with foreign state, (ii) External aggression: Hostile act by foreign state without formal war declaration, (iii) Armed rebellion: Organized violent uprising within India threatening constitutional order, (d) Safeguards: Written Cabinet advice mandatory, Parliamentary approval within 1 month by special majority, judicial review. Illustrates constitutional learning: Emergency powers balanced with democratic safeguards post-1975 experience.