Sinha had demand that the prime minister should appear before the Joint Parliamentary Committee in the 2G scam case to 'clear his name' following allegations levelled against him.
Yashwant Sinha had on Monday written to the Prime Minister. In his letter, Sinha said any hesitation on his part to appear before JPC will prove that he has "something to hide".
The former finance minister claimed that in his communications to the JPC, Raja has levelled "serious allegations" against the Prime Minister and Finance Minister P Chidambaram.
"I think it is in your own personal interest to appear before the JPC and clear your name. You may also suggest the Finance Minister to make a similar offer," he wrote.
Congress spokesperson Rashid Alvi has said the prime minister has nothing to do with the JPC.
The BJP had hit out at JPC Chairman PC Chacko on Tuesday for not calling Raja to depose. Sinha, who is also a member of the JPC, raised serious objections over not convening of the panel meeting for the last two months and demanded that Raja's concerns be listened as he is a key witness in the scam.
Chacko has dismissed Sinha's allegation and his letter to the PM as a political stunt.