We're being told Parliament has lost its sense of decorum because MPs have lost their respect for Parliament as an institution. 

Green MP Julie Anne Genter is facing disciplinary action from her party after walking across the debating chamber to confront National Minister Matt Doocey, during a debate on Wednesday night. 

Former Cabinet Minister Peter Dunne told Mike Hosking that Genter's behaviour is part of a wider trend that's been happening for several years. 

He says there's always been robust debate, anger, and passion. 

But, Dunne says, people used to be able to control the way they presented that and show respect towards each other and the institution as a whole. 

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• 'Dreadful': Former House Speaker criticises Julie Anne Genter's debate chamber confrontation