A former Green Party leadership contender, Vernon Tava, is seeking the National Party nomination in the Northcote byelection.
He confirmed speculation today that he is putting his hand in the ring but said he could not comment further.
He would not say when he joined National.
Tava stood for the Greens co-leadership in 2015, when incumbent and Climate Change Minister James Shaw won.
Tava also stood as the Green Party candidate in Northcote in 2011 and is a frequent political commentator, including on www.nzherald.co.nz and on Newstalk ZB.