The proposed changes to the IAS cadre rules has triggered another confrontation between states and the Union government led by Prime Minister Narendra Modi. Several state governments – headed by non-BJP parties in particular  – have accused PM Modi of damaging cooperative federalism. In this episode of Let Me Explain, Anna Isaac looks at the political row over the IAS cadre rule changes and why Modi, who once championed federalism, is now being accused of weakening state rights.