National Party leader Bill English says his party has "had no indication of what decision New Zealand First will make".
A spokesperson for Mr English said National would hold a caucus meeting at 11am tomorrow to update MPs on coalition talks, followed by a teleconference with the board.
"We stress that we have "had no indication of what decision New Zealand First will make".
NZ First said in a statement today it would be announcing what party it would support to form New Zealand's next government tomorrow afternoon.
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