New Delhi: Stepping up his attack on the ruling BSP in Uttar Pradesh over the CMO murder issue, senior Congress leader Digvijaya Singh on Tuesday said his party will "expose" the Mayawati government, while making a fresh demand for a CBI probe into the incident. "We will expose the Mayawati government. This corruption trail is also reaching her door...Mayawati should order a CBI inquiry into the case (CMO murder case). "There have been three murders related to the office of Lucknow Chief Medical Officer. Mayawati has expelled two ministers saying they committed mistakes. But it was never told what those mistakes were," Digivijay said after a meeting with Prime Minister Manmohan Singh.