In the two years to January 2017, 660 Kiwi passport holders were sent packing and since then several hundred more have suffered the same fate. Many of them have joined gangs here, increasing the criminal sophistication of them.
This pernicious Australian policy should be treated by Ardern with boxing and not kid gloves when she meets Turnbull in early March.
A couple of current blood-boiling examples should be enough to convince her.
Born in American Samoa and adopted by a Kiwi uncle living in Australia, Alex Viane has never set foot in this country. This 40-year-old by his own admission is no angel, racking up a string of convictions, and is now being deported here as an undesirable character.
His partner, two daughters and two grandsons and large family are in Australia but his visa's been cancelled, he's in detention, with his bags packed.
Thirty-year-old Jacob Symonds is a nasty piece of work, with more than 200 convictions, racially motivated bashings, robbery and carrying weapons. Symonds is considered to be brain damaged because of excessive drug use and is a danger to society.
He moved to Australia with his adoptive parents when he was 1 but is being sent back here, essentially because the Aussies want to transfer the danger.
Is it worth a falling out with Australia over this? You betcha!