European Union leaders are holding a key summit with Turkey in Brussels on ways of dealing with Europe’s worst refugee crisis since World War Two.
The EU is pressing Turkey, through which many migrants transit, to take some back in return for $3.3bn in aid.
Turkey is reportedly asking for that sum to be doubled. The talks are being extended into a working dinner.
Meanwhile Turkey’s President Recep Tayyip Erdogan accused the EU of failing to deliver on the promised aid.
“It’s been four months,” Mr Erdogan said in Ankara. “My prime minister is currently in Brussels. I hope he will return with the money.”
Turkey is currently sheltering more than 2.7 million refugees from the civil war in neighbouring Syria. The EU wants Turkey to take back migrants who do not qualify for asylum and do more to patrol its own waters.
In exchange for this, the Turkish government is asking for the EU to increase its pledge to €6bn ($6.6bn; £4.64bn), European Parliament President Martin Schulz said.
Turkey is also seeking a faster path towards EU membership and the speeding up of plans to allow Turks visa-free travel in Europe.
Turkish PM Ahmet Davutoglu told reporters that he was proposing a “new package” designed to “strengthen Turkish-EU ties not only on the illegal migrants issue but also in all challenging issues as well as Turkey’s EU accession process”.