BRUSSELS—Half of European Union’s leaders meet in Brussels on Sunday to seek a common solution to the bloc’s politically toxic migration issue, a long-unresolved conundrum now threatening to topple the EU’s most powerful leader, Germany’s Angela Merkel.
Discord over how to process and find homes for migrants reaching the bloc is once again causing deep strains between EU capitals, three years after a million people, mostly fleeing the war in Syria, came to Europe, partly encouraged by Ms. Merkel’s open-door policy.
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