A Washington Post article claiming New Zealand First as a far-right party that is poisoning the country is malicious and was not written by a sane person, the deputy prime minister says.
Defending his party, Winston Peters suggested the New Zealand-based author had escaped from an insane asylum before publishing the piece, which argued the impact of the far-right was already being felt through the government's plans to ban foreign buyers purchasing existing homes.
It also accused Prime Minister Jacinda Ardern of kow-towing to Mr Peters "increasingly extreme" demands in order to secure government.
"No sound, sane person could have written that malicious, totally false statement," Mr Peters said from Vietnam on Friday (NZ time).
Ms Ardern laughed off the report, saying having been compared herself to US President Donald Trump - by both the Wall Street Journal and New York Times - Mr Peters was in good company.
"I'd suggest that the Washington Post probably hasn't interviewed anyone from New Zealand First, or potentially even a voter, before making those assumptions," she said in defence of her coalition partner.