Images of crying children separated from their parents at the US border with Mexico have brought a new urgency to the migration debate in the US. After a week of intense scrutiny on the issue, President Trump signed an executive order so that families apprehended trying to enter the US illegally would not be split up while criminal proceedings took place. In Europe, too, the migration debate is testing governments. This week, the German Chancellor, Angela Merkel, went to battle with her Interior Minister, Horst Seehofer, over whether migrants at the German border should be turned away if they had registered elsewhere in the EU. So, as the UNHCR says the world is experiencing record levels of migration, should countries get tougher or adjust to the new reality? Are public concerns justified, or are they fanned by populists hoping to make political gains?