National Party officials have been made aware of some resurfaced comments from their Maungakiekie candidate.
19 years ago, National's Greg Fleming had previously compared same-sex civil unions to polygamy and incest.
Fleming has since distanced himself from the remarks, saying he supports the current state of marriage laws.
Political commentator Brigitte Morten says turning this into a big scandal feels like an over-reach, as Fleming made these comments as head of a socially conservative think tank two decades ago.
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