The popularity of the Leader of the Opposition and Tauranga MP Simon Bridges has taken another hit in the latest political polls.

But the MP has previously told SunLive that it's the party's popularity that counts, and that part of the poll tells a different story.

But firstly, Judith Collins has eased ahead of Bridges by one point in the preferred Prime Minister stakes according to the latest 1 News Colmar Brunton poll.

In the previous two polls, Collins and Bridges had polled equally at six per cent in February and five per cent in April. But now six per cent prefer Collins and just five per cent prefer Bridges.

Prime Minister Jacinda Adern dropped six points to 45 per cent after polling her highest ever preferred PM rating of 51 per cent April.

The Newshub Reid Research Poll had similar results in the preferred PM stakes.

Bridges fell to 4.2 per cent, but Collins was up to 7.1 per cent. That poll put Ardern slightly higher for preferred prime minister, at 49 per cent.

The Newshub poll was also bad news for Simon with just 17.4 per cent of people thinking he was performing well as National's leader, while 56 per cent thought he was performing poorly.

Ardern secured her highest approval rating yet, with 72.5 per cent of respondents saying she was performing well as Prime Minister and 5.6 per cent thought she was performing poorly.

The Newshub poll had National diving 4.2 points to 37.4 per cent, whereas Labour's support soared to 50.8 meaning it could govern alone. The Green Party polled at 6 per cent and New Zealand First at 2.8 per cent.

In terms of party support the polls tell a different story. Colmar Brunton had National at 44 per cent and Labour at 42 per cent. That meant National had gone up four points and Labour down six points.

The Greens remained steady at six per cent, while New Zealand First rose slightly to reach the five per cent MMP threshold.

According to the Newshub Reid Research poll, 55 per cent of voters thought it was wrong for National to pre-release Budget information before Budget day, and 32.6 per cent thought it was right thing to do.