The Prime Minister says an Aussie travel bubble is looking increasingly difficult to get over the line by the end of March.
Jacinda Ardern says that's on a country-to-country level, and they haven't ruled out moving state-by-state.
It comes after Australian officials on Monday put a 72-hour stop to the one-way quarantine-free bubble with New Zealand.
Ardern says work on a two-way arrangement is ongoing - and they're continuing to pursue it.
She says if we are to enter into a transtasman bubble arrangement, we need to give confidence we won't see closures at the borders with very short notice.
Listen above as Australian correspondent Steve Price speaks with Mike Hosking.