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Speaking to the Herald tonight, Collins said she was "extremely disappointed" in the Government, given that Covid-19 has come back to New Zealand.
"I am, like I'm sure the rest of the country is, extremely disappointed that this [Covid-19] has been allowed in through our borders."
Just over an hour before, Ardern had announced that as a result of four new cases of community transmission – all from the same family in South Auckland – the Super City will go into level 3 lockdown from 12 noon on Wednesday, until midnight Friday.
The rest of the county will move into level 2 over the same period.
"We're asking people in Auckland to stay home to stop the spread," Ardern said in an emergency press conference at the Beehive tonight.
But Collins was not impressed, given the fact she said New Zealanders have been told that the country was free of community transmission.
Sunday had marked 100 days since the last case of community transmission.
"We believed it had happened; this has clearly come through a border and must not be something that was homegrown in New Zealand.
"I have seen the Prime Minister tonight, who is leader of the Labour Party, in the middle of an election campaign, speaking about all this failure."
Collins was meant to be campaigning in Tauranga tomorrow and is staying in Auckland tonight.
But the Papakura MP is heading back down to Wellington tomorrow morning.
"It is important, in my opinion, that I be in Wellington so that I can actually undertake the role of the Leader of the Opposition – so that's what I'm planning to do."
In fact, when speaking to the Herald, Collins detailed parts of a call she had with Ardern earlier this evening.
"She [Ardern] said that the family [the new cases of Covid-19] have had to wait for retesting because of possible false positives."
Collins speculated that this meant the family would have been retested and found positive "some days ago".
She pushed back on any suggestion that she was politicising the situation.
"I would be accused of a dereliction of duty if I did not do my job as Leader of the Opposition.
"We clearly have a failure that is disappointing – I am actually so disappointed that we are not in a situation that we have been told we were in."
NZ First leader Winston Peters has temporarily suspended his party's campaign.
Ardern said she'd spoken to National leader Judith Collins about 8.30pm to advise her about the information about the case and the proposed course of action.
Ardern said her focus was on the immediate cases and hasn't given any thought to postponing the election yet.