A former Finance Minister says New Zealand faces uncharted territory - as the world grapples with Donald Trump's tariffs. 

New Zealand, Australian and Asian markets tumbled yesterday, but regained some ground today.

Current Minister Nicola Willis is warning the tariffs and world events will impact the Government books. 

Steven Joyce says given the daily uncertainty which will slow investment - no one can predict what will happen.  

"I don't think Donald Trump knows, to be blunt - I don't think he knows quite where it lands and he's making it up every day as he goes along. And I think that's one of the problems." 

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