The Green Party is tight-lipped on the cost of an investigation into suspended MP Darleen Tana.\xa0
The MP has been stood down since March 14, while an investigation takes place into her involvement into allegations of migrant exploitation at her husband's business.\xa0
Green Party co-leader Chl\xf6e Swarbrick told Mike Hosking \u201cEvery political party has funding that they can use at their discretion.\u201d\xa0
Swarbrick said \u201cObviously we would prefer that we weren't doing this investigation\u201d\xa0
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