The Prime Minister says she has complete confidence in the border regime, and the government's ability to keep people in isolation facilities if they refuse to be tested as their release date approaches.
There's fresh scrutiny on the testing regime, with National claiming not enough is being done to make sure those in managed isolation or quarantine are having a test at day three, which was part of tougher new rules introduced in June.
Fifteen people have also refused the day 12 test - while the government can't force them to take the test, it can refuse to release them from the border facilities.
Here's RNZ political editor Jane Patterson.
