It submitted a restructuring plan last month. Last week, CAW President Ken Lewenza said the Canadian union had reviewed the United Auto Worker's tentative concessions agreement with GM and would negotiate its terms based on that agreement. Lewenza said a key goal would be that Canada maintain its market share. GM Canada's viability plan hinges on what happens with its parent company, which sparked long-held fears last week after GM filed an annual report with the U.S. Securities and Exchange Commission revealing that auditors have raised substantial doubt about its ability to continue operations. GM has already received $13.4 billion in U.S. government loans and is seeking a total of $30 billion from the government. Its restructuring plan also includes laying off 47,000 workers worldwide by the end of the year, which include about 4,000 that will be cut in Canada. GM will also close five more U.S. factories.