Legislative procedure, constitutional convention, and quo warranto can all be invoked to test PAC chairmanship eligibility.

Article 212 protects only procedural irregularities in legislative proceedings; it does not bar review where the impugned action is alleged to be substantively illegal or unconstitutional. The text also states that a long-standing and constitutionally compatible practice of appointing an opposition member as Chairman of the Committee on Public Accounts may crystallise into an enforceable constitutional convention. It further explains that the Chairmanship can be treated as a public office for quo warranto where eligibility is in doubt, and that a petition raising constitutional issues about disqualification and legislative appointment may be maintainable as a public interest petition.

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Issues: (i) whether the Speaker's nomination of the Chairman of the Committee on Public Accounts, made by treating the concerned member as belonging to the opposition, was protected by Article 212 of the Constitution of India; (ii) whether the asserted practice of appointing an opposition member as Chairman of the Committee on Public Accounts amounted to a binding constitutional convention; (iii) whether a writ of quo warranto would lie in respect of the office of Chairman of the Committee on Public Accounts; and (iv) whether the petition was maintainable as a public interest petition.

Issue (i): Whether the Speaker's nomination of the Chairman of the Committee on Public Accounts, made by treating the concerned member as belonging to the opposition, was protected by Article 212 of the Constitution of India?

Analysis: Article 212 bars judicial inquiry only into alleged irregularities of procedure in legislative proceedings. The distinction between procedural irregularity and substantive illegality is controlling. Where the impugned action is said to be illegal or unconstitutional, judicial review is not excluded. The nomination was made on an assumed factual foundation that the concerned member belonged to the opposition, although his alleged defection and disqualification were already in issue before the Speaker. That went beyond a mere procedural lapse.

Conclusion: The action was not immune under Article 212 and was open to judicial review.

Issue (ii): Whether the asserted practice of appointing an opposition member as Chairman of the Committee on Public Accounts amounted to a binding constitutional convention?

Analysis: A constitutional convention is established only when there are precedents, a belief that the practice is binding, and a reason for the rule. The Speaker's own announcement recorded a long and healthy tradition of appointing an opposition member as Chairman of the Committee on Public Accounts, and the appointment was expressly made on that basis. The convention was found to support constitutional values and the functioning of legislative committees, and it was not shown to be contrary to any express constitutional provision.

Conclusion: The practice was held to be an enforceable constitutional convention.

Issue (iii): Whether a writ of quo warranto would lie in respect of the office of Chairman of the Committee on Public Accounts?

Analysis: Quo warranto lies where a person holds a public office without legal authority or suffers from disqualification to hold it. The Chairmanship of the Committee on Public Accounts was treated as a public office because it is created within the constitutional scheme, involves discharge of public functions, and carries powers affecting public finance and legislative oversight. Since the validity of the member's continued eligibility was in doubt and the nomination was made before disposal of the disqualification petition, the office could be challenged by quo warranto.

Conclusion: A writ of quo warranto was held to be maintainable.

Issue (iv): Whether the petition was maintainable as a public interest petition?

Analysis: The controversy involved constitutional issues concerning legislative functioning, disqualification, and the legality of appointment to a public office. In that setting, the petition could not be rejected merely as a private dispute because the challenge raised matters of public constitutional importance.

Conclusion: The petition was held to be maintainable.

Final Conclusion: The nomination of the Chairman of the Committee on Public Accounts was treated as justiciable, the claimed convention was accepted as binding, and the matter was carried forward by directing production of the disqualification order before the Court.

Ratio Decidendi: Article 212 protects only procedural irregularities in legislative proceedings, while substantive illegality or constitutional violation remains subject to judicial review; a long-standing, constitutionally compatible legislative practice, once established by precedent and accepted as binding, can operate as a constitutional convention enforceable in law, and an office involving public functions may be examined through quo warranto if the holder's eligibility is in doubt.

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