The Comptroller and Auditor General of India Vinod Rai will today brief the Joint Parliamentary Committee probing the 2G scam. The JPC, headed by Congress leader PC Chacko, had on Sunday sought to know from Mr Rai as to how he quantified the losses in the spectrum allocation to the tune of 1.76 lakh crore rupees. The CAG, in its report to Parliament last year, had pegged presumptive loss to the exchequer on 2G spectrum allocation at 1.76 lakh crore rupees. The findings created a political storm and subsequent events led to the resignation and arrest of the then Telecom Minister A Raja. According to the CBI charge sheet in the 2G spectrum allocation case, the loss to the exchequer is pegged at 30,984 crore rupees. The JPC has decided to call CBI Director A P Singh to brief on the 2G case at its meeting on 7th June, while the Finance Secretary, Chief of Enforcement Directorate, and Telecom Regulatory Authority Chairman J S Sarma will make presentations on the issue. Sarma had begun his presentation on the functioning of TRAI and its role in the telecom sector which was inconclusive and would continue on June 8.