National is promising a Covid-19 inquiry if it's elected.

The Northland region was plunged into level three last year after women who travelled there returned positive Covid-19 results.

Now officials have admitted they issued travel permits in error.

National Party Covid-19 spokesperson Chris Bishop says his party would have an inquiry started within the first 100 days of taking over.

He told Mike Hosking a variety of people would be on the panel.

Bishop says he'd like retired judges, economists and health professionals.

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