Judith Collins and Willie Jackson trade insults on The AM Show

Two veterans of the New Zealand politics traded verbal blows on The AM Show on Friday morning.

Judith Collins and Willie Jackson were meant to be talking about Auckland's new fuel tax and the great meth hoax, but couldn't resist getting dirty.

Ms Collins threatened to dump a donut on the head of her "silly boy" opponent, while Mr Jackson defended himself against her "aggression".

Mr Jackson gave as good as he got though, accusing Ms Collins of "demonising poor people", and calling her and Paula Bennett - or should that be "Paula Benefit" - "powerhouse women ministers".

Watch the fiery encounter.