A member of the New Zealand Jewish council has resisted condemning National candidate William Wood around a photo taken of him impersonating Hitler.

Wood, now 18, was pictured posing like Hitler with what appears to be a painted on small moustache.

Spokesperson for the New Zealand Jewish council Juliet Moses told Heather du Plessis-Allan we should cut Mr Wood some slack.

"I wouldn't want to be judged by my 14 year old self, and I suspect most people have made errors of judgement when they were 14."

Meanwhile, an unlikely pair have teamed up to defend a young National Party election candidate after the photo surfaced online.

New Zealand First leader Winston Peters and Act leader David Seymour have both expressed some sympathy for William Wood, who is National's Palmerston North candidate.

The pair took a break from their very public slanging match to comment on the photos this afternoon when approached by reporters outside the House.

"We all make mistakes when we were young – I would think it's part of the growing up process," Peters said.

But he did quip that "by the looks of it, he's still growing up".

It appears to be a photo he sent to a friend – or group of friends – which appears to have been leaked.

Wood told TVNZ the photo was an error and has apologised.

He said he was 14 when it was taken.

"I apologise for any offence I may have caused."

Seymour said he wouldn't be punishing someone for something they did when they were 14 – "I would just tell them it was something that was very bad taste."

"I certainly hope that, if he is now mature enough to be a candidate he understands it's the wrong thing to do."

But he said that frankly, "going after someone for something they did when they were 14, no matter how stupid, I don't think helps New Zealand solve its problems."

Seymour and Peters have been at each other's throats over the last couple of weeks over a number of issues.

It started off fairly bloodless, having cracks at each other on Twitter about having fistfights.

"There'd be three hits - you hitting me, me hitting you, and the ambulance hitting 100. Thank your lucky stars I'm not into physical violence," Peters Tweeted.

This was in response to comments about his age from Seymour.

Speaking to reporters, Seymour denied this.