Reiterating its demand for a JPC probe into the 2G spectrum scam, the BJP on Monday charged the government with indulging in cover up activities to shield corrupt people. Talking to reporters in New Delhi, party spokesman S S Ahluwalia demanded that either the CVC P J Thomas himself resign or the government nullify his appointment. Mr Ahluwalia made it conditional that the opposition is ready to run both the houses, if the government acceded to its demand for JPC probe. Meanwhile, the Congress described the opposition demand for JPC as illogical and purely political. Talking to reporters in New Delhi, party spokesman Abhishek Manu Singhvi argued that the investigation by central agencies like CBI, Enforcement Directorate and Income Tax authorities will be more effective than the probe by a JPC. He said the central agencies have the powers to punish the guilty but not the JPC. Replying to a question, Mr Singhvi denied any pressure on the government from some of the UPA allies for setting up of a JPC.