A former senior TVNZ political reporter is among the potential Labour candidates for the byelection in the seat of Mana in Wellington.

Labour MP Winnie Laban accepted a job at Victoria University before she told her party leader and colleagues of plans to leave politics by the end of the year.

Labour MP and former Minister for Pacific Affairs Luamanuvao Winnie Laban is leaving Parliament to work as assistant vice chancellor Pasifika at Victoria University.

Phil Goff says Chris Carter is not his problem any more and Labour's caucus is moving on.

John Key says Labour MP Chris Carter should have to provide a doctor's certificate for his two months off work for stress-related issues.

A lawyer is now acting for dissident Labour MP Chris Carter who is to take two months off work for stress-related issues.

Labour leader Phil Goff says he thinks errant MP Chris Carter is "unwell" and should have taken Helen Clark's advice to move on if his heart wasn't in his job.

Labour Party president Andrew Little has dismissed a claim made in a letter written by Chris Carter that leader Phil Goff could not win the next election.

Labour leader Phil Goff says ousted MP Chris Carter doesn't have a mandate to continue as MP for Te Atatu.