The migration policy debate in Australia has shifted over the years from boat arrivals and refugees to a new battleground: the size of the net overseas migration intake.  

And Pauline Hanson has managed to put the push for lower numbers back at the centre of the political debate.  

But how much control does the government really have? Today, David Speers, host of tonight's ABC National Forum on migration, on whether the system we have needs a total rethink.   

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David Speers, host of Insiders and the ABC’s National Forum