Labour campaign manager MP Phil Twyford has called out National Party leader Bill English for "overreaching".
He told Duncan Garner on The AM Show Bill English is acting as if he'll still be Prime Minister when the deals are done, even though National failed to win a majority of votes.
"I think he's overreached a bit. He's been sounding as if he's got this commanding moral authority and mandate. He's a caretaker Prime Minister right now."
While the preliminary count shows National won 46 percent of votes to Labour's 35.8 percent, Mr Twyford says the winner of the election is the party that can form a Government - not the party with the most votes.