A referendum on increasing the parliamentary term to four years is looking highly likely. 

This is despite a Select Committee Report confirming ACT - who proposed the bill - will only support it if stronger checks and balances are built into the system.

This includes more powers to the opposition in committees.

But Justice Select Committee Chair Andrew Bayly says they're suggesting possible dates. 

"It's had almost unanimous agreement across the Committee that we should put it to referendum - the question is when."

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