E.U. leaders gather for a summit in Brussels on Friday.
They were due to discuss the migration dilemma but instead the talks have been overshadowed by a row over spying.
It follows claims that the phone of German Chancellor Angela Merkel and millions of French calls have been monitored by the US National Security Agency.
She warned the U.S. that eavesdropping on allies was unacceptable, saying "spying on friends, that's just not done".
(SOUNDBITE) (German) GERMAN CHANCELLOR ANGELA MERKEL SAYING:
"I think the most important thing is to find a basis for the future on which we can operate and as I said today trust needs to be rebuilt, which implies that trust has been severely shaken, and the members of the European Union shared those concerns today. But we all know that we have such important tasks in the world that we can only master together, and that we are responsible for our mutual security that we simply need to look into the future. Obviously words wi