New Delhi, Sep 16 (ANI): Former CAG Vinod Rai on Tuesday said that any action can’t be taken against Former Prime Minister Manmohan Singh over the 2G scam and that the main involvement was of Former Telecom Minister A Raja. He said that whatever was written in the audit report is what is mentioned in his book. He also hinted on a coalition pressure on Singh but said that this cannot be said with surety.