Swamy said the opposition committed a "strategic mistake" by agreeing to the Government's proposal to form the JPC instead of pressing for strengthening the Public Accounts Committee (PAC) which was examining the 2G issue.
"Chacko's conclusion in the draft report of the JPC that Raja alone is responsible for corruption involved in issuance of 2G Spectrum licences amounted to the breach of the principles of natural law of justice," Swamy told PTI here.
The opposition parties also committed a strategic mistake in insisting for the formation of a JPC to examine the alleged irregularities in the 2G spectrum allocation issue,he said.
Instead,they (opposition) should have collectively pressed for strengthening the PAC as it was a constitutional body. On the contrary, JPC was formed "to serve the interests of the ruling party", he said.
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The opposition parties should have tried to have the 2G scam examined by the PAC whose Chairman (M M Joshi of BJP) was from the opposition. PAC members were elected through a single transferable vote in Parliament and had greater scope for an independent inquiry than the JPC, he said.
He said opposition has a justification on carrying on their protest in Parliament demanding Chacko's resignation as JPC chairman and press for removal of Law Minister Ashwani Kumar in the light of the CBI Director Ranjit Sinha's affidavit in the supreme court.