The National Party has raising the prospect of a hung Parliament or even a second election, if voters don't deliver a clear National - ACT government.
A few weeks ago, National leader Christopher Luxon said he could work with New Zealand First if he had to.
Now, he and his colleagues are not so sure. This week, we sit down for an extended interview with the leaders of the two largest parties.
We'll hear from Labour's Chris Hipkins on Tuesday.
Luxon spoke to Corin Dann.