DAB chairwoman Starry Lee says comments by a senior mainland official on the next chief executive do not amount to a new requirement for the job.
Wang Guangya had earlier said that Hong Kong's next leader must be someone the central government can trust. Lee said the chief executive answers both to Beijing and the people of Hong Kong, so if he or she cannot earn the trust of the central government, "Hong Kong's development will be very difficult".
Her remarks come after Wang, Director of the Hong Kong and Macau Affairs Office, told a pro-Beijing magazine of the trust criterion in a recent interview.
Analysts say this is a new requirement, as Wang had previously only suggested the SAR's leader has to love the country and love Hong Kong, win the support of Hong Kong people and be capable of governing.
Lee said she believes Wang's comment serves as a reminder that the Two Systems principle only exist under the One Country framework and people shouldn't harbour any thoughts of self-determination.