The re-establishment of border controls and passport checks in Europe as a result of the migration crisis could cost the continent some $109 billion, according to a new report.As a result, the removal of a Schengen passport-free travel zone would reduce GDP by 0.8 per cent, said the research by the French Government.The Dutch migration minister, Klass Dijkhoff, has said member states will ask the European Commission for permission to extend border controls from May onwards if they cannot stem the flow of refugees from the Middle East and Africa.Such an outcome makes a deal reached on a US$3 billion migration fund for Turkey agreed this week.Under the financing deal agreed on Wednesday, the European Commission will double its initial share of the fund to 1 billion euros ($1.1 billion) while the EU 28 member states pay the remaining 2 billion euros. Germany will contribute the largest sum with 427.5 million euros coming from Berlin, followed by the UK, France and Italy, which will each provide 224.9 million euros."The money we are putting on the table will directly benefit Syrian refugees in Turkey, helping to improve their access to education and healthcare in particular," said EU Commission Vice President Frans Timmermans.