Iran’s President Hassan Rouhani on Wednesday told the United States it “should not plot against the Iranian nation every day”, amid fresh tensions between the arch foes in the Gulf. Tehran and Washington have traded barbs over a spate of incidents in the past year involving their forces in the sensitive waters of the Gulf. President Donald Trump then tweeted that he had ordered the US Navy to “shoot down and destroy any and all Iranian gunboats if they harass our ships at sea”.