NRC: Subramanian Swamy attacks Mamata Banerjee, suggests President's Rule in West Bengal

Subramanian Swamy was speaking on NRC list and said that there was no moral, social or political reasons that these people should stay in India. He said that there are provisions in the constitution of India via which one can apply to be the resident of this country. But these people came in illegally. 
He went on to say that West Bengal should have President's rule