New Delhi: Opposition leaders yesterday pressed for prompt action against Lok Sabha member Mani Kumar Subba for allegedly forging his birth certificate to prove his Indian citizenship and the Central Bureau of Investigation (CBI) too filed an affidavit in the Supreme Court that the documents the Congress MP from Assam filed about his place of birth were forged.

"Subba should be immediately sacked from the house and criminal proceedings initiated against him for forging documents," deputy leader of the Bharatiya Janata Party (BJP) in the Lok Sabha Vijay Kumar Malhotra said.

Additional Solicitor General Gopal Subramaniam told the apex court bench that the CBI had found the birth certificate of Subba "not genuine". Subba represents Tezpur of Assam in the Lok Sabha. The bench had raised doubts over Subba's citizenship on January 19 and had asked him to submit various documents to the court to prove that he is an Indian citizen.