Why Opposition is demanding for JPC?

• BJP leader L.K. Advani today said his party was forced to press for a JPC probe into corruption issues after Leader of Opposition Sushma Swaraj was not allowed to speak in Lok Sabha on it.
• Reiterating its demand for a JPC, BJP also said the PAC was not equipped to deal with all aspects of the 2G Spectrum allocation scam.
• "For example, the Niira Radia tapes are there. Can Radia tapes be discussed or investigated by PAC because there is no mention of Radia tapes in the CAG report? But, of course, in the affidavit of the CBI in the 2G Spectrum case Radia tapes are mentioned.
• It is  alleged that about 2,000 hours of conversation in the tapes show how the Union cabinet was formed and how portfolios were allocated.
• "On advice of the PM, a council of ministers is constituted. But who was advicing the PM? If you go through the Radia tapes you can know which person can become the Communications Minister and who will benefit whom. Those people were lobbying. Are we going to allow the lobbyists to form the Cabinet? It should be investigated and you can do so through JPC and not PAC," BJP said.
• Anybody, including the PM, could be summoned by the JPC if it felt they are involved in the 2G Spectrum allocation scam.