"Rs 10 to 15 crore is spent on stadiums. It should be investigated as to what kind of money is used to fund (the rallies)," he told the media while launching his personal website here.
Sibal said, "he (Modi) has made speeches from podiums, cameras around you. Showing of beautiful stadiums.
"If you really want to bring back blackmoney - and that should be the case as Advaniji always says - then the Rs 10 to 15 crore is spent on stadiums. There should be a debate. It should be investigated as to what kind of money is used to fund (the rallies)," he said.