Former DAB vice-chairman Greg So Kam-leung, who was recently made a deputy minister, is expected to give up his Canadian passport soon amid mounting controversy over his foreign nationality. A source in the Democratic Alliance for the Betterment and Progress of Hong Kong said Mr So would make an announcement in the next few days. But it is understood the government will not require other appointees to give up their foreign passports. 'An undersecretary giving up one's foreign nationality doesn't mean the others have to follow suit. If Mr So is to give up his passport, it would be his own decision,' a government source said, stressing the appointments and procedures had been legally sound. But the source said the administration was aware of the pressure on other appointees to come clean on their nationality once Mr So relinquished his Canadian passport. The Basic Law prohibits foreign nationality for principal officials but does not provide for deputy ministers and their nationality requirement. A DAB source said Mr So had 'no room for negotiation' because the incident had generated too much public concern and he must control the damage. It is understood that the majority of the party's central committee members agreed at a meeting that Mr So should give up the passport. In response to criticism that Mr So had not shown political sensitivity, the party's chairman, Tam Yiu-chung, said: 'I believe he will think about the matter seriously and decide what to do.' Mr So could not be reached for comment yesterday. The Legislative Council Establishment Subcommittee demanded yesterday that the government disclose the salaries and nationalities of the appointees. The government has so far only said they would be paid between HK$193,775 and HK$223,586 a month. Wong Kwok-hing, a lawmaker for the Federation of Trade Unions, sided with the pan-democrats in pushing for higher transparency on nationality. 'Those with foreign passports cannot have the best of both worlds. They are being groomed as political talents and should show their commitment.' Liberal Party chairman James Tien Pei-chun also urged appointees with foreign nationality to give up their passports. 'The earlier the better, especially for those who really have political ambition.' The government source said the administration would consider revealing more pay details without giving names. Alan Hoo, chairman of the Basic Law Institute, said the mini-constitution only required principal officials to be appointed by the central government and it was not its intent to include deputy ministers. 'If we lower the requirement to deputy ministers, we have to surrender more autonomy,' Mr Hoo said, adding that it would be a 'political rather than legal' question on whether they should voluntarily drop their foreign residency status.