President Trump threatens further strikes on Iranian infrastructure

US President warns the government in Tehran they know what needs to be done "fast". Air Marshal Edward Stringer explains how militaries choose their targets, and an American lawyer explains why he thinks war crimes are being committed. Also on The World at One, we hear from a teacher forced to leave the profession after balancing work and parenting became impossible, and the head of roads policy at the AA will explain sky-rocketing diesel prices.