US President Donald Trump floated a new plan to reopen the Strait of Hormuz, a senior official said.Under the plan, the United States would continue its blockade on Iranian ports, while coordinating with allies to impose higher costs on Iran’s attempts to subvert the free flow of energy, according to a senior administration official.Trump is weighing multiple diplomatic and policy options to push Iran to end its chokehold on the waterway, said the official, who spoke on condition of anonymity because they were not authorised to comment publicly.