Labour's defending its idea of a fourth amnesty visa for overstayers, saying many are still incognito. 

If elected, the party's promising another one-off visa for people who have been in the country for more than a decade and were impacted by the 1970's dawn raids. 

Immigration Minister Andrew Little told Mike Hosking that even after the last couple amnesties, many people were still afraid to come forward. 

He said that this is a way of saying that for those who came here, raised their families, have been working, have been doing all the right things, they will let them off on this one occasion. 

Little said that they want to give a signal that these situations are rare. 

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