Congress today strongly denied all speculations of a rift within the government over the 2G Spectrum issue. Briefing reporters in New Delhi, party spokesman Manish Tewari lashed out at the Opposition for demanding Home Minister P Chidambaram's resignation for his alleged role in the 2G Spectrum scam. He said the matter is sub-judice and is also being probed by the Joint Parliamentary Committee. Mr. Tewari said everyone including the BJP should refrain from commenting on the issue.