A rift over Europe's response to the sudden arrival of hundreds of thousands of refugees is leading some in Brussels to voice fears for the future of the European Union.
"What was unimaginable before is possible today - that is the disintegration of the European project," Frans Timmermans, the European Commission vice-president coordinating EU action on the migration crisis, told the Friends of Europe think-tank.
While German Chancellor Angela Merkel is urging EU countries to open their doors and their hearts to refugees, other leaders see the top priorities as controlling the EU's external borders to stem arrivals, deporting more people denied asylum and paying third countries to keep refugees on their soil.
"The migration crisis will determine the future of our political family," Orban told delegates. "We are in a deep trouble. The migration crisis is able to destabilise governments, countries and the European continent."
BRUSSELS | By Paul Taylor