US President Donald Trump took everyone by surprise on Friday 23 May when he raised the possibility of imposing an additional 50% tariff on European products starting 1 June. For the time being, he has only “recommended” such a tariff, on his social network Truth and nothing has yet been confirmed. The announcement came just hours before a telephone call between the European Commissioner for Trade and Economic Security, Maroš Šefčovič and US Trade Representative Jamieson Greer...