US President Donald Trump's latest tariff changes have heightened uncertainty for businesses and consumers, industry experts and economists say.
The changes followed a Supreme Court ruling on Friday that Trump could not use a 1977 law - the International Emergency Economic Powers Act - to levy taxes on imports from nearly every country in the world.
On Saturday, Trump signed a proclamation using an alternative law, Section 122 of 1974's Trade Act, that would let him put a new 10% temporary tariff on goods from all countries. Then on Saturday he posted on social media that he would be increasing these tariffs to 15%.
The latest announcement raises uncertainties for countries, including the UK and Australia who had previously negotiated 10% tariff deals with the US.
While other comments from Trump have heightened fears that new levies could be imposed on goods that have been exempted until now.
