New Zealand First has recorded a strong result in the latest poll - with just 100 days to go until the election.

The party has recorded 9.4 percent support in the latest Newshub Reid-Research poll, an increase of 1.8 percent and the highest result it has recorded in that poll.

The increase comes as immigration continues to be a key election-year issue, with debate about whether steps need to be taken to reduce record arrival numbers.

Peters has hit out at Labour over its position to "turn down the tap" on immigration, saying the party cannot be trusted to do so.

He has also pledged to make the re-entry of the Pike River mine a "bottom line" in any post-election coalition talks, and promised to get the Christchurch Cathedral rebuilt.

Meanwhile, the Labour Party has recorded a significant drop in the same poll, falling by 4.4 percent down to 26.4 percent. This is the lowest result on the same poll since the last election.

Labour Party leader Andrew Little said he is unconcerned with the outcome of the poll, and that he instead goes "on what New Zealanders are telling [him]." 

National is holding strong on 47.4 percent, a very slight increase, while the Greens have picked up some of Labour's slack, gaining 1.3 percent.

The poll has a margin of error of 3.1 percent.