A Roy Morgan opinion poll shows support for the National Party remaining above 50%.
The poll has National unchanged since May on 52% support, Labour up two points to 33%, and the Greens down one point to 7.5%.
Support for the Maori Party is down half a point at 2.5%, level with ACT, which had risen half a point.
The telephone poll of 868 electors was held over the first two weeks of June and has a margin of error of plus or minus 1.4 percentage points.
