Going, going - almost gone.

MPs from all parties other than ACT are shutting down the Treaty Principles Bill today, with passionate displays of rhetoric.

It's been called, 'embarrassing', 'grubby', and a 'stain on our country' during the debate.

Architect of the failed Bill, David Seymour, says he'd be happy to push for a Treaty referendum  in future coalition negotiations.  

"That is absolutely a possibility, we wouldn't rule that out. But sooner or later, the logic of this bill is going to prevail."

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