Pressure is building on National leader Judith Collins as a Newshub-Reid Research shows Act continuing to siphon away the party's support.
Labour is down 0.3 points to 42.7 per cent but National also fell in the poll published tonight, dropping 1.8 points to 26.9 per cent.
Act is up 4.9 points to 16 per cent.
Jacinda Ardern is on 41.7 per cent as preferred prime minister. That's down 3.8 points from the last poll.
National leader Judith Collins is down 2.1 points, sitting at 6.1 per cent.