Union home minister Amit Shah on Sunday launched a fresh attack on West Bengal chief minister Mamata Banerjee, saying the way leaders of her Trinamool Congress (TMC) are joining the Bharatiya Janata Party (BJP), there will be no one left except her in the party at the end of the assembly elections. Shah made the remark after five TMC rebels joined the BJP ahead of the assembly elections, scheduled to be held in April-May this year. "Mamata Banerjee has done injustice to people of the state. She has taken West Bengal backwards in every sphere. People of the state will never forgive her," Shah said during a rally at Howrah.