ACT leader David Seymour says he has spoken personally to some of his supporters to tell them to get vaccinated and "don't be a dickhead".
"I've had a few people saying I know someone who is a big admirer of ACT and isn't getting vaccinated and I've personally spoken to some of them," Seymour said.
"And said, mate, get vaxxed.
"Don't be a dickhead."
It follows Green co-leader Marama Davidson who had been trying to have one-on-one kōrero for weeks about the vaccine with four of her nieces, which strained their relationship.
"They got vaccinated this week," she said earlier this month.
"And our whanaungatanga survived. Enough to cry about," Davidson wrote.
"Came down to access and dropping the 'judgy aunty' vibe."
Prime Minister Jacinda Ardern left on a last minute regional tour over the weekend in an attempt to boost vaccine levels.
On Monday, she said vaccine officials were looking to local heroes and influencers to urge people to get vaccinated.
"Everyone is an influencer in their own family," she said.
Ministry of Health data today showed 5.8 million vaccinations administered to date in New Zealand - that was made up of 3.4m first doses and 2.4m second doses.
On Sunday, 33,000 people had their second Pfizer vaccine dose, making them fully vaccinated.