Judith Collins has said she is focusing on recovering from a "very difficult week" and supporting leader Simon Bridges after the latest political poll revealed she is ranking only 2 points below him as the preferred Prime Minister.

The 1 News Colmar Brunton Poll shows leader Simon Bridges fell in the preferred PM stakes from 10 to 7 per cent, his lowest rating since becoming leader, while Collins is on 5 per cent.

Jacinda Ardern was up 2 per cent to 42 per cent support, while New Zealand First leader Winston Peters had dropped 1 per cent to 4 per cent.

The poll follows a week of unprecedented political turmoil for the National Party, as Botany MP Jami-Lee Ross laid a police complaint about alleged electoral fraud and traded insults and accusations with Bridges and the party.

Speaking with Kate Hawkesby this morning, MP Judith Collins said the support is "flattering" but she's focused on the "end game".

"We are all very much sticking together and focusing on the end game which is not worrying about ourselves but getting back to what people care about."

She said being in opposition "is the toughest job in Parliament" and they have had a hard week, but the party vote is still holing up.

When asked whether Bridges polling at 7 per cent meant he was "toast" Collins said that's not necessarily true. 

"Helen Clark used to have some pretty bad polling at some stages in opposition...We have had a very difficult week and let's see how we go, but my point is the party vote is holding up and it will come back."

She said they are focusing on holding the current Government to account.

"I have spent a lot of this week working with Simon and the rest of our team but it's a very tough business.

She said while it's only one poll, taking Winston Peter's number three spot for preferred Prime Minister is "mildly interesting and fun"

"It's only a poll and my view is it's only a snapshot in time so we will just keep focused on what matters."

The poll showed the National Party dropped 2 per cent to 43 per cent support, with the Labour Party was ahead al at 45 per cent support, up 3 per cent from the last poll.

The Green Party was up 1 per cent to 7 per cent support, while NZ First was steady on 5 per cent - right at the threshold for entering Parliament.

The Act Party did not register in the poll.

LISTEN ABOVE AS JUDITH COLLINS SPEAKS WITH KATE HAWKESBY