David Seymour says we now have a price on the mistake made by Parliament's Speaker Trevor Mallard.
It's been revealed the taxpayer's footed a $330,000 dollar bill for Mallard's settlement and legal costs of a defamation action - after he wrongly called a staff member a rapist.
The ACT leader says Mallard accused a person of the most serious and heinous crime.
Seymour told Si and Phil he should go - and whether or not that happens is a test of Jacinda Ardern.
He says Mallard has the confidence of Parliament with 61 votes - and Labour has 64 excluding him.