Latest polling shows National will need New Zealand First on board to form a government.
The latest Newshub-Reid Research poll shows Labour's fallen slightly to 26.5% and National's dropped to 39.1%.
The Greens' boosted to 14.2%.
With ACT's 8.8% the right-bloc would have 60 MPs, just below the 61 needed to form a government.
New Zealand First's 5.2% would be required.
Political commentator Dr Grant Duncan told Tim Dower that Luxon 'had to' end the speculation, because in all likelihood, he may be having to make that call after the election.
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