Kumar, who met Singh at his South Block office, is learnt to have discussed the observations made by the apex Court wherein it had pulled up the CBI, PMO and Coal Ministry officials for changing the "heart" of the coal scam probe report.
The Court had also directed the government to come out with a law before July 10 to insulate the CBI from "external influence and intrusion".
The apex court had also made a reference to the Law Minister's role in vetting the probe report and asked, "does it not subvert the integrity of the investigation if changes are brought in status report on the suggestion of Law Minister and government officers."