'BJP polluted the Ganga,' Mamata on PM's dip in holy river

West Bengal Chief Minister Mamata Banerjee on Tuesday said Prime Minister Narendra Modi remembers the Ganga river, which is regarded as the "mai" (mother) by lakhs, only during elections to get votes, a day after he took a ritualistic dip in the holy river before inaugurating the Kashi Vishwanath Dham in Varanasi. Watch.