Former Lok Sabha speaker Somnath Chatterjee said today nobody was questioning how Union Home Minister P Chidamabaram's letter to West Bengal Chief Minister Buddhadeb Bhattacharjee, asking the state government to disarm CPI(M) cadres, was leaked. "No one is asking how the Home Minister's letter was leaked, yet a reply is being sought from the chief minister," Chatterjee said. "Some words have been used in the letter which I have never heard in the course of my long political career," he said apparently referring to use of 'harmad vahini' in the letter. "State government does not function under the Centre. So such language should not be used. The country will be ruined if Centre-State relations are based on politics," he said at a programme here. In a federal structure, the state and Centre should have a harmonious relation, he said.