To sceptics, Donald Trump’s war in Iran is a hubristic blunder that could spiral further out of control and bring catastrophe to the world. To Lindsey Graham, it is a dream come true. The Republican senator from South Carolina spent decades spoiling for a fight with the regime in Tehran. He claimed that its overthrow would give the US president his own “Berlin Wall moment”. Now he is urging further escalation by invoking the bloody battle of Iwo Jima from the second world war. For Graham’s critics, his sway over Trump, and his seemingly insatiable appetite for war at any...