Rahul Gandhi's comparison of the Rashtriya Swayamsevak Sangh (RSS) to the Muslim brotherhood today provoked an acrimonious rejoinder from a furious BJP, which demanded an immediate apology. "The RSS is trying to change the nature of India. There is no other organisation in India that wants to capture India's institutions... What we are dealing with is a completely new idea. It's an old idea being reborn. It is similar to the idea that exists in the Arab world of the Muslim Brotherhood. The idea is that one ideology should run through every institution and one idea should crush all other ideas," the Congress president said at the International Institute of Strategic Studies in London.