Prime Minister Jacinda Ardern says ministers are working to get an exemption for New Zealand from the US' imposition of tariffs on steel and aluminium.

Ardern is holding her first press conference since returning to New Zealand from her Pacific Mission last week.

She believed New Zealand had a strong case for an exemption because of its long defence and security relationship with the United States.

She said New Zealand was clearly not an intended target of the tariffs, given its steel exports to the US were small. She said New Zealand also imported more from the US than it exported so there was not the trade imbalance that was concerning US President Donald Trump about some countries.

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Ardern said New Zealand's relationship was similar to Australia's in many ways and Australia had been given the exemption. Both New Zealand and Australia are 'five eyes' intelligence partners with the US.

After three people died in a high-speed chase in the Tasman district over the weekend, Ardern was asked for her views on the police pursuits policy.

The Automobile Association called for a review of the practises followed by Police and for the Government to consider a ban on them.

The PM said there were more than three million police stops a year and about 300 led to police pursuing.

"Obviously there have been a number of cases now in the public domain that noone would think was a good outcome, particularly the tragic loss of innocent lives." She said IPCA were undertaking a review, and that seemed the best place to look at the protocols and how they were working.

National leader Simon Bridges has said he would support a review but would be reluctant to see a ban or any changes that would be an incentive to people to try to out run the police, in the hopes the chase would be abandoned.