In a statement, the party Politburo also demanded that the Joint Parliamentary Committee (JPC) probing the spectrum allocation case should summon "both the Prime Minister and (former Telecom Minister) A Raja to testify".
Referring to the "fresh evidence" appearing in the media about the PMO's role, it said the report on the file notings and documents of the PMO "reveals the complicity of the PMO in the illegal and arbitrary policies adopted by the then Telecom Minister A Raja in the 2G spectrum allocations".
The party demanded that the role of the PMO should be "specifically enquired into by the CBI" and the JPC should summon both the Prime Minister and A Raja to testify.