Critics have accused President Donald Trump of being unstable and threatening Iran with "Death, Fire and Fury" after he posted a message on social media threatening oil shipments. The president warned that any attempt to block oil shipments would lead to an attack "TWENTY TIMES HARDER" and that it would be "virtually impossible for Iran to ever be built back, as a Nation, again." Critics argue that this threat crosses a line of wartime belligerence and could lead to the largest refugee crisis in modern history. Iran has responded to the U.S.-Israeli military campaign by threatening to attack ships passing through the Strait of Hormuz, effectively cutting off some 20% of the world’s oil.