Probing the multi-crore rupee Saradha scam, the Central Bureau of Investigation (CBI) has called up West Bengal Transport minister Madan Mitra and Trinamool Congress MP Srinjoy Bose.According to sources, both of them have been asked to appear before the agency during the week.While Mitra will be the first state minister to be grilled, Bose a Rajya Sabha member was interrogated by the CBI earlier, too.While the minister was not available for comments, Bose said he has been called by the agency as a witness and like a good citizen he will abide by the order.Reacting to the development, BJP MP and union minister of state for urban development Babul Supriyo said: "The noose around the Trinamool is getting tighter and days are not far behind when the all those who swindled poor people's money will be behind the bars".