Kerala Chief Minister Pinaryai Vijayan wrote to counterparts in 11 non-BJP ruled states today, urging them to unite in their opposition to the controversial citizenship law. In his letter Mr Vijayan spoke of "apprehensions (that) have arisen among large sections of our society" over the amendments to the Citizenship Act of 1955 and said "people from cross-sections of society... need to stand united in preserving basic tenets of our polity which form cornerstone of Indian democracy".