Luxon Catches Caucus Off-Guard With Promise To Hold MMP Referendum If Re-ElectedGiles Dexter Political reporterChristopher Luxon has caught his caucus off-guard with a seemingly off-the-cuff campaign promise to hold a referendum on the MMP voting system if re-elected. Louise Upston said the prime minister was "reflecting a conversation" that many people were having around potential changes to MMP. Tama Potaka said what the prime minister said was up to the prime minister, and his focus was on serving the people of Hamilton West. Goldsmith was not sure if it was an announcement from the prime minister, saying Luxon was simply answering a question. Deputy Prime Minister David Seymour said that sort of commentary did not help New Zealand, but put in a dig of his own.