Shimla, Jan 16 (ANI): Himachal Pradesh Chief Minister Virbhadra Singh on Thursday filed a defamation case against BJP leaders Arun Jaitley, PK Dhumal and his sons, Arun Thakur and Anurag Thakur. The BJP leaders have alleged that the Congress leader accepted Rs 1.5 crore and Rs 2.4 crore through cheques in his and his wife, Pratibha Singh's name from Venture Energy and Technology Pvt Ltd, which was executing a power project in the state. Earlier, Singh defended himself saying that he is being hounded by former Himachal Pradesh CM PK Dhumal, his sons and the BJP at large.