"Nutty" is how the United Future leader is describing the Conservatives Party.
Peter Dunne says National will destroy itself if it hitches itself to the Colin Craig-led party, saying on Twitter "these people are extreme and nutty".
Mr Craig's courted controversy by saying Kiwi women are the most promiscuous in the world and don't deserve taxpayer funded contraception.
The Prime Minister has rejected those comments.
Mr Dunne has hit out at two of his own former MPs who are now prominent in the Conservatives, Gordon Copeland and Larry Baldock, saying no party needs extremists like them.
Photo: Peter Dunne (Getty Images)