Bhopal/ New Delhi, June 23 (ANI): Madhya Pradesh Chief Minister Shivraj Singh Chouhan on Monday said he is preparing to file defamation suit over allegations leveled by the opposition parties against his wife and his government pertaining to the Vyapam Scam. Earlier, Congress leader K. K. Mishra, who had leveled allegations of Union Minister Uma Bharti being involved, asked Chief Minister Chouhan to order a probe in the multi-crore Vyapam Scam and also alleged the involvement of a powerful person in this case. The recruitment scam had reportedly involved manipulation in the selection process for government jobs conducted by the Madhya Pradesh Professional Examination Board (MPPEB). A Special Task Force has been constituted for an investigation into the Vyapam scam which had detained Laxmikant Sharma, a former state technical education minister, for interrogation. The high profile teacher's recruitment scam in Madhya Pradesh is being linked to Chief Minister Shivraj Singh Chouhan's wife, Sadhna Singh.