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Mr Cunliffe told TV3's Firstline programme this morning that there was no substance to claims from the National Party that the policy was too expensive.
"There's no substance whatsoever in those claims, that's just National electioneering."
He said comments that the policy was indicative of "Labour big spending" were wrong and the party's alternate budget showed surpluses.
"I will not be lectured to by National's spin doctors or the press about Labour big spending, because it's just not true. We're running surpluses and we're sticking very closely to the government's own spending tracks, we just have better priorities."