Donald Trump has been warned that the US military needs more time to prepare for strikes against Iran, as another night of protests rocked the country.

U.S. President Donald Trump says Iran has proposed negotiations after his threat to strike the Islamic Republic as a crackdown on demonstrators has led to hundreds of deaths.

On Monday afternoon, Mr. Trump issued a new threat, saying in a social media post that the United States would impose a tariff of 25 percent on “any and all business” done with the United States by co...