"We have said that the scam cannot be a work of one person alone," said BJP spokesperson, Nitin Gadkari while briefing the media on the charges made by A Raja.
The party further said that they wanted to know why the Prime Minister did not respond to the letters written by Raja adding that the party was exposed by their own ex-member, A Raja.
"Sonia should explain how the party will deal with the corrupt," said Gadkari.
"Foreign Minister should explain how Unitech sold spectrum to foreign firms," he said.
Talking about Karnataka CM Yeddyurappa, he said that necessary action would be taken after the party receives an official copy from Justice Hegde.
Raja in front of Special CBI Court judge OP Saini had alleged that the sale of the spectrum was done with the knowledge of Prime Minister Manmohan Singh and accused the then finance Minister P Chidambaram of approving the sale of spectrum allocation to DB Realty.
Raja also said that he have done nothing wrong and only followed the policy of the NDA government, adding he had "implemented only what I have inherited."