New Delhi, Oct 17 (ANI): The BJP on Thursday assailed the Congress government after a second chargesheet was filed against senior IAS officer Ashok Khemka, who had earlier exposed the land deals done by UPA President Sonia Gandhi's son-in-law Robert Vadra in Haryana. BJP leader Balbir Punj said that the act shows the double standard of the Congress party which had earlier backed another IAS officer Durga Shakti Nagpal who exposed the sand mafia in Uttar Pradesh.