As to whether the investment naturalisation system was intra vires the 1956 Act in principle or intra vires the Act as operated is a matter about which I have very serious misgivings. However, successive Ministers for Justice granted citizenship in accordance with it. The Senator will appreciate that, at this stage, one would need to have very strong legal grounds before proceeding to revoke some citizenships and not others. Naturalisations which were intra vires the Minister, though improper, cannot be revoked on that ground only. If they were ultra vires the Minister, it would be a different matter. An interdepartmental study would not cast light on this issue.