Ardern says Australia's deportation policy is "corrosive"
Australia's conservative government has in recent months moved to deport thousands of foreigners convicted of crimes as part of an immigration crack-down that can also strip dual-nationals of their Australian citizenship.
The move has seen hundreds of people deported from Australia to New Zealand, a country that some left when just children and have few ties to.
The two countries have fought in numerous conflicts alongside each other, and squabbles between the two rarely break-out beyond playful, light-hearted banter over sport and culture.
Roughly 650,000 New Zealand citizens - more than a tenth of the smaller country's population - live in Australia.
Morrison, however, was unapologetic and promised no change in Australian policy.
