European Union leaders pose for a group photo at the start of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018. Reuters/Yves Herman/Pool

Belgian police officers keep guard outside the EU commission headquarters ahead of an emergency European Union leaders summit on immigration, in Brussels, Belgium June 24, 2018.

German Chancellor Angela Merkel talks to the press after an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

European Commission President Jean-Claude Juncker waits for guests at the start of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

French President Emmanuel Macron talks to the press after an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Italian Prime Minister Giuseppe Conte, Bulgarian Prime Minister Boyko Borisov, Maltese Prime Minister Joseph Muscat, German Chancellor Angela Merkel, Austrian Chancellor Sebastian Kurz, Spanish Prime Minister Pedro Sanchez and Finnish Prime Minister Juha Sipila pose for a group photo at the start of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Italian Prime Minister Giuseppe Conte is welcomed by European Commission President Jean-Claude Juncker at the start of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

German Chancellor Angela Merkel is welcomed by European Commission President Jean-Claude Juncker at the start of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Greek Prime Minister Alexis Tsipras talks to the press after an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Spanish Prime Minister Pedro Sanchez talks to the press after an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Image used for illustrative purpose. Flags of 16 EU countries are seen ahead of an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.

Maltese Prime Minister Joseph Muscat talks to the press after an emergency European Union leaders summit on immigration at the EU Commission headquarters in Brussels, Belgium June 24, 2018.