Prime Minister Jacinda Ardern said she had seen reports about the death threat, but had not seen it herself.
"But I know that when you're in this job, you do receive threats. I won't see all of them. And I won't know about all of them. But it unfortunately comes with the job.
"If I got told about every single piece of feedback like that I would spend a lot of time hearing it. There are thankfully a great group of people around me who help manage that side of things."