Fail migration test and UK could quit, Tusk warns EU

By Alastair Macdonald BRUSSELS (Reuters) - European Council President Donald Tusk warned European Union leaders on Wednesday that if they fail to end disputes over how to handle the migration crisis they could help drive Britain out, undermining the bloc. Addressing a debate in the European Parliament on issues discussed by the summit he chaired last week, Tusk said how the EU handles migration would be "of key significance" to the outcome of June's British referendum on whether to leave the EU.