Donald Trump's latest tariff deadline is rapidly approaching. 

The US President has reached 11 deals, and agreed to pause tariff increases for Mexico, ahead of his deadline of 4pm today. 

He's indicated he'll raise the baseline tariff faced by most countries, including New Zealand. 

US Correspondent Richard Arnold told Mike Hosking that at the same time, the trade wars are facing a critical court test within the United States. 

The Trump team is being sued by a coalition of states and businesses who claim Trump has been overstepping his powers when it comes to some of the steepest tariffs. 

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