Even as the supreme court agreed to hear Digvijay Singh’s plea on Thursday, Madhya Pradesh chief minister Shivraj Singh Chouhan said on Tuesday that he will ask the high court to order a CBI probe into the Vyapam scam.

"I have full faith in the judiciary but recent events have led to an atmosphere that the investigation should be done by the CBI," he said at a hurriedly convened news conference in Bhopal.

Meanwhile, the supreme court will hear a plea by Congress leader Digvijaya Singh and three whistle-blowers into the Vyapam scam. An apex court bench headed by chief justice HL Dattu on Tuesday said these petitions would be taken up on July 9 along with two others seeking removal of Madhya Pradesh governor Ram Naresh Yadav so that he could be prosecuted for his alleged involvement in the scam.

Singh and the three whistle-blowers - Ashish Chaturvedi, Anand Rai and Prashant Pandey - while demanding for a SC-monitored CBI probe said they have no faith in the state Special Task Force on the scam.

The multi-crore scam became murkier on Monday with a mysterious third death linked to the scandal but the centre ruled out a CBI probe despite allegations of witnesses being deliberately eliminated.

At least 40 people including witnesses, accused and beneficiaries connected to the racket have been found dead since 2013, when the arrest of 20 people in Indore blew the lid off the massive scam that has seen over 2,000 arrests including top bureaucrats and middlemen.

Meanwhile, as the opposition continues to demand prime minister Narendra Modi's statement on the Vyapam scam, union law minister Sadananda Gowda on Tuesday said that the PM need not answer on silly issues.

While speaking to news agency Gowda said that concerned ministers and party president have answered on the Vyapam scam and asking for PM's reply on each silly issue in unfair.