The One News Colmar Brunton poll released last night has support for Labour at 53 per cent, National at 32 per cent, NZ First at 2 per cent, and the Greens at 5 per cent, and ACT is at 5 per cent.

The New Conservatives and Māori parties are each on 1 per cent.

On those results, Labour could govern alone.

Labour leader Jacinda Ardern has 54 per cent in preferred Prime Minister, while National's Judith Collins is at 20 per cent. ACT leader David Seymour and New Zealand First's Winston Peters are each at 1 per cent.

Collins has a 27 per cent approval rating as National leader, however, considerably higher than Muller and Bridges.

On measures of people's trust for the party leaders, Ardern is at 82 per cent, Collins is at 47, and Peters is at 34 per cent.

The new poll followed one from Newshub-Reid Research on Sunday, which had the National Party's popularity sinking to new lows.

That survey - the first since Judith Collins took over as leader - showed National slumping to 25.1 per cent.

That's down from 30.6 per cent in May, a result which spelled the beginning of the end for then-leader Simon Bridges. Labour was on 60.9 per cent - up 4.4 points.

National campaign chair Gerry Brownlee denounced the Newshub-Reid Research poll as a "rogue" result.

Speaking from the campaign trail in Palmerston North, Collins told reporters she felt "very strongly" that the results were "clearly false".

National released its internal polling to MPs on Tuesday, and, on Wednesday, Collins told Morning Report that the results are "close to" 47 per cent and 36 per cent, presumably in favour of Labour.

Heather Roy, a political commentator and former ACT deputy leader, told Checkpoint the poll felt "much more realistic" than the Newshub-Reid Research poll on Sunday.

"I think most of the parties will probably agree with that, particularly the two major parties. It's worth bearing in mind that no party in the last 69 years has got more than 50 percent and I still don't think any party will get more than 50 percent at this election."

Dave Cormack, political commentator and former policy advisor to the Greens, told Checkpoint he did not think tonight's poll showed that the last one was "rogue". Instead, he thinks it reflects the period which people were polled.

"There hasn't been good news for National for a very long time. I suppose this week's been good insofar as no one has resigned."

"I've never seen anything like it."

Roy says Collins would be happy with the upward trend for her as leader compared to her predecessors, but would not be satisfied with 20 percent as preferred Prime Minister.

"She'll be striving hard to lift that," she says.

She expects National's support to rise and Labour's to drop before the election.

Roy says National will need to pull something "revolutionary" out of the bag for New Zealand's economy to be able to get their support up.

Cormack agrees that National needs to announce a policy that could get people excited.

"I'm sure there will be a 10-lane road announced in the coming days."

Cormack says Labour will be reluctant to announce any policy that risks alienating voters while they're polling at such high numbers.

Both agreed the poll indicated New Zealand First and its leader Winston Peters were in serious trouble.

-RNZ.