AN attempt by trade unionist Lee Cheuk-yan to move a private member's bill to halt labour importation is likely to be blocked by a constitutional ruling. The Government says the bill, which Mr Lee plans to move on behalf of unionists in the Legislative Council, will cost money. Bills can be ruled out of order if the Legco president rules they have 'a charging effect'. The bill, which seeks to amend the Immigration Ordinance, suggests no working visas should be granted to overseas workers with the exception of skilled labour and overseas domestic helpers. It has given the unionists bargaining power in negotiations to delay implementation of the proposed supplementary labour scheme, intended to replace the general scheme from January. Mr Lee promised to defer gazetting the bill and decided to grant the Government a month's 'discussion period', which will start this week. The Government has agreed that all aspects of the new scheme, including the quota and timetable for implementation, are negotiable. But a government statement said yesterday: 'This requirement [of the bill] in effect obliges the staff of the Immigration Department to re-assess a foreign national's skills . . . on each and every occasion he returns to Hong Kong from an overseas trip.' It said the bill obliged the department to undertake a new function and therefore raised a demand on public revenue. The recommendation was handed to Legco president Andrew Wong Wang-fat whose ruling is final. But Mr Lee said: 'The Government is playing tricks by questioning the technical areas of the bill.' He questioned why his bill, similar to the one moved by the Democratic Party last session, had run into problems while the Democrats' had not. 'It seems the Government is very insincere about holding discussions if it raises the issue at this moment,' he said. At a discussion with officials yesterday, the unionists demanded the Government give a detailed breakdown of what sort of industries needed labour imported. The Government promised to reply next week.