Finance minister Pranab Mukherjee had questioned the role of home minister P Chidambaram in the 2G spectrum allocation issue in March, 2011. 

A letter sent by the finance ministry suggested that if Chidambaram had insisted, 2G spectrum could have been auctioned instead of being sold at throwaway prices on a first-come-first-serve basis.

According to Times Now the letter also suggested that Chidamabaram, who was the finance minister during the 2G spectrum allocation in 2008, could have over-ruled the then telecom minister A Raja to bring transparency in the process.

The note was produced on Wednesday by Janata Party president Subramanian Swamy before the Supreme Court bench of Justice GS Singhvi and Justice AK Ganguly hearing his plea for a CBI probe into Chidambaram''s role in the scam.