US President Donald Trump announces taxes on steel and aluminium imports, causing sparks to fly and markets to melt, but his core voters seem happy. The BBC's Joe Miller reports from the Conshohocken steel mill in Pennsylvania, owned by ArcelorMittal. The move has caused alarm among America's trade partners, but also within the US itself, as economist Dr Pinar Cebi Wilber explains. Also in the programme, author Jay Heinrichs explains why, if we want to persuade people to see things our way, then instead of taking Trump's confrontational approach, we should behave more like cats. Yes, that's right, cats. (Picture: A worker breaks down a metal tank at a scrap metal yard in Cleveland, Ohio; Credit: Brendan Smialowski/AFP/Getty Images)