The European Commission has started legal action against three member states - Poland, the Czech Republic and Hungary - because of their refusal to take in refugees stranded in Italy and Greece. Hungarian PM Viktor Orban, who says his decision is about preserving the EU's identity, says there is no chance of a single EU-wide migration policy. As tens of thousands of people continue to make their way into the EU in the hope of a safer and better life, what could and should the EU be doing?