New Zealanders may have a new prime minister by day's end, with a crunch caucus meeting of the National party set to decide on Chris Luxon's leadership. If a no-confidence vote succeeds, Mr Luxon will be replaced by one of his colleagues, just three months out from the November 7 election. (Mick Tsikas/AAP PHOTOS)Adding intrigue to Wednesday's meeting, there is no obvious contender to replace Mr Luxon. Advertisement AdvertisementAdvertisement AdvertisementDeputy Leader Nicola Willis, Education Minister Erica Stanford, Transport Minister Chris Bishop and Police Minister Mark Mitchell have all been mooted as replacements. The accepted thesis is National's popularity slide is down to Mr Luxon, who has shocking personal favourability ratings.