France would no longer stop migrants from crossing over to the UK and invite banks there to relocate to France if the UK leaves the European Union (EU), France's Finance Minister Emmanuel Macron reportedly said Wednesday.

Macron's warning comes right before a UK-France summit where Brexit — the proposed exit of the UK from the EU — will be the top agenda. While UK Prime Minister David Cameron and his government are in favour of staying a part of the EU, other politicians, especially London's Mayor Boris Johnson, have told the public to "ignore scaremongers" and vote for the UK's exit from the EU during the June 23, 2016, referendum vote, reports BBC.

"The day this relationship unravels, migrants will no longer be in Calais," Macron told the Financial Times. He also said France would roll out "red carpets" for bankers in the UK to relocate.

Macron, in an interview with the FT, said if the UK were to exit the EU, it would no longer be allowed to conduct border controls on the French side.

The UK has two checks — Calais and Dunkirk — where migrants coming in are processed. Recently, the French Police came down heavily on thousands of migrants stationed at Calais to force them to evacuate the camp. called "Jungle".

Cameron has also warned the public if the UK leaves the EU, migrants could enter the country from the "Jungle". However, pro-exit groups have dismissed Cameron's warnings as "scaremongering." They have also been quoted by the Telegraph as saying low-skilled workers would see an increase in wages if the exit happened.

Ahead of the Thursday summit, BBC quoted Cameron as saying: "I am convinced that the UK's membership of the EU gives us greater security and greater capacity to project power globally. In an ever-more uncertain world, we gain from our membership of these international organisations."