Parliament's Speaker, Trevor Mallard, will appear before a select committee at on o'clock to face questions about a legal dispute that cost taxpayers more than $300,000.
Mr Mallard claimed last year that a rapist was working at Parliament, leading to defamation proceedings.
The National Party has been calling for his resignation, saying they've lost confidence in him.
Māni Dunlop spoke with RNZ's Deputy Political Editor, Craig McCulloch.
