National Party leader Judith Collins says Jacinda Ardern could have suspended Parliament if she was concerned about safety.
In person Parliament returned for the first time since the latest Covid-19 outbreak began, with a reduced number of MPs and Ministers, after opposition parties shot down plans for a virtual one.
On Tuesday Ardern told Morning Report she believed a return to Parliament was not responsible, and she would have preferred to go virtual, but the opposition turned it down.
Collins said there were other options.
"If the Prime Minister was worried about it she could have just suspended parliament for another day."
She said politicians had no practice running Parliament via Zoom and having it in person allowed her party to ask their questions.
Both the Green Party and Te Paati Māori refused to attend in person Parliament. The Greens will send one person for alert level 3, while Te Paati Māori will not return until alert level 2.