Labour leaders are backing Clayton Cosgrove after the MP faced questions over legislation he promoted that could have benefited a land owner who made a donation to his campaign last year.
The former member for Waimakariri, who's now a list MP, appeared on TV3's The Nation to answer questions about $17,500 in campaign donations from Independent Fisheries Ltd (IFL), which owns land in western Christchurch.
Mr Cosgrove introduced a private member's bill in July 2009 that would have helped pave the way for the development of land in the area, including some belonging to IFL, by protecting Christchurch Airport from noise complaints.
Electoral Commission returns filed by Mr Cosgrove show IFL, which had previously given money to his campaign and that of National's Christchurch Central candidate Nicky Wagner, made a $2500 donation to him a few months later.
The firm gave a further $15,000 to Mr Cosgrove's campaign in June last year.