Himanta Biswa Sarma to NDTV: It is very painful that Mamata Banerjee whom I respect so much is accusing me without any kind of fact and circumstances, CBI had called me as a witness. I joined the investigation much before I joined the BJP in fact after I was called to stay in Congress for more three months and even CBI in the court has given statement that I am just a witness , so Mamata didi's effort to join dot with me, my party to Saradha scam is very painful.