"This is a perverse report and fraud report and cannot be considered to be JPC report," CPI leader Gurudas Dasgupta said outside Parliament along with BJP leader Yashwant Sinha.
Both parties were also highly critical of Speaker Meira Kumar's ruling disallowing any debate on the issue at the presentation stage during Zero Hour.
The report, which gave a clean chit to Prime Minister Manmohan Singh in the 2G spectrum scam saying he was "misled" by the then Telecom Minister A Raja, was tabled in the Lok Sabha by JPC Chairman P C Chacko amid pandemonium.
Asked whether CPI has joined hands with BJP, Dasgupta said, "We are all members of JPC and no party is untouchable on the floor of Parliament."
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BJP said it was "unprecedented" the way it was tabled in the House and voiced unhappiness with the Speaker's conduct.
"It was unprecedented. The manner in which the report was finalised was in violation of rules and norms of the House," Sinha said.