Mr Dunne defended championing the bans, saying they were necessary to ensure the public good.
"The items are simply being removed from the market while their public safety is assessed. Their ongoing status will then be determined by an independent committee."
Mr Dunne also revealed he believes SIS head Warren Tucker briefed Labour leader Phil Goff on allegations Israeli spies had been caught up in the Christchurch earthquake.
Mr Goff has denied receiving information on the allegations, despite Mr Tucker releasing papers showing the pair had discussed the issue.
"I am inclined to believe Warren Tucker - particularly since the paper notes he discussed it with Phil Goff - and Tucker has always struck me as a pretty straightforward person, but it is unlike Phil to get caught like this. He is usually so precise," Mr Dunn said.
In a question Mr Dunne described as the "toughest" of the day, MHD asked who he would vote for if he had to choose between New Zealand First leader Winston Peters and Act leader Don Brash.
"Assuming abstention was not an option, it would be a reluctant vote for Brash."
Mr Dunne followed the live chat with a tweet where he stated he had never denied smoking pot, and that unlike Clinton, he did inhale.
- HERALD ONLINE
