BRUSSELS (Reuters) - Envoys of France, Britain, Germany, the European Union and Iran discussed the nuclear deal in Brussels on Tuesday, a German official said, ahead of an expected announcement by U.S. President Donald Trump to pull out.

“We have been in the closest contact for weeks, especially with E-3 partners (France and Britain), from working level to foreign ministers,” the official said.

“In the coming days, it will also be important to remain in discussion with all sides to avoid an uncontrolled escalation.”