US President Donald Trump says he is considering a massive attack on Iran, "bigger than ever before." US objectives have changed from regime change to eliminating the country's nuclear program to reopening the Strait of Hormuz. Now another strait is blocked, causing chaos for global shipping. DW’s Ben Fajzullin analyzes three scenarios put forward by experts Kelly Grieco of the Stimson Center and Megan Sutcliffe from Sibylline on the way forward in the war.