Winston Peters has taken a big swipe at David Seymour's ACT Party today, saying he would check himself into a lunatic asylum before even thinking about the party.
His remarks came after 1 NEWS' Jessica Mutch had asked Mr Peters a question about ACT, while in Auckland today.
Mr Peters had shot back: "The day I stop to even think about the ACT Party, is the day I think I’ll check myself into a lunatic asylum."
He finished with, "thank you very much", before heading towards the NZ First bus, but then turned around to add: "They don't matter in this campaign.
"This is a three-way fight and you'll find that out."
It was big talk against a party that could yet be a coalition partner with Peters' NZ First - and National, after this Saturday's election.
It's not the first time Mr Peters has attacked ACT. Just over a week-ago he labelled Mr Seymour a "badly bred dog that barks at everything that goes by", after the ACT leader criticised Mr Peters' decision to pull out of the TVNZ minor party debate.
In August, Mr Seymour called NZ First MP Richard Prosser a "F**king idiot".