But Liberal Party's Selina Chow warns it could lead to a constitutional crisis Donald Tsang Yam-kuen has defended his plans to reform the Executive Council, arguing that far from reducing ministers' powers, it will allow them to push through controversial policies as long as they have the support of the chief executive. But the reform plan was immediately greeted with caution by Exco member Selina Chow Liang Shuk-yee, who warned there would be a constitutional crisis if a minister and the chief executive bulldozed a policy through Exco despite the opposition of other members. Speaking live on an RTHK radio programme yesterday, Mr Tsang said his plan to invite more non-official members to sit in his cabinet would not mean less freedom for ministers with policy portfolios. Mr Tsang said that if proposals by ministers were not backed by colleagues in Exco, they could still push them through provided they had the chief executive's support. 'But if [Exco] totally does not accept his proposal and thinks it is not viable, then the minister will have to reconsider ... Of course, if the chief executive supports him he can carry out the policy, but the minister will have to take full responsibility,' Mr Tsang said. 'Remember this - ministers are ministers and this system will not weaken his final decision.' Mr Tsang has made reform of Exco one of the key planks in his platform in his campaign to become the next chief executive. He proposed that under the new system, individual policy secretaries would be asked to attend the weekly meeting only when issues under their portfolio were being discussed. Mrs Chow, vice-chairwoman of the Liberal Party, said that while reform was needed to allow more representatives of political parties to join the policymaking process, Mr Tsang should devise a way to ensure that unofficial members were bound by collective responsibility once a policy was decided. She said it was vital also to determine how much accountability a minister should bear if a policy went wrong. 'He has not thought out clearly how to reconcile these two problems. It would be unfair for both the ministers and the unofficial members,' Mrs Chow said. She warned of problems if ministers tried to force through policies without Exco approval. 'There would be a constitutional crisis.' Another Exco member, Leung Chun-ying, also said there would be problems if Exco was enlarged and stressed that a balance of roles and responsibility must be reached.