The Calais mayor said Britain must take "the consequences" of their choice
French politicians are demanding that Britain takes back its border after voting to leave the European Union.
The Mayor of Calais Natacha Bouchart said an immigration deal which allows Britain to check passports in France, preventing migrants from crossing the Channel, should be renegotiated.
Ms Bouchart told French broadcaster BFM TV: "The British must take on the consequences of their choice."
"We are in a strong position to push, to press this request for a review and we are asking the President to bring his weight (to the issue)."
"We must put everything on the table and there must be an element of division, of sharing."
Her demand was echoed by the centre-right president of the Hauts-de-France region, Xavier Bertrand, who tweeted: "The English wanted to take back their freedom, they must take back their border."
The Touquet agreement, signed in 2003, effectively put the border with Britain on French soil.
It has meant that many migrants intending to reach the UK are left stranded in camps, such as Calais' 'jungle' on the French coast.
Prior to the referendum, French finance minister Emmanuel Macron warned that a Brexit could cause the treaty to collapse, resulting in migrant camps being moved from Calais to Britain.
"The day this relationship unravels, migrants will no longer be in Calais," he said.
However, those remarks have now been contradicted by the French government.
Speaking after the referendum result, French government spokesman Stephane Le Foll said bilateral immigration treaties between Britain and France will not be affected by the Brexit.
"On the question of immigration, to be clear, British exit from the European Union will not lead to changes in terms of immigration treaties with United Kingdom...These are bilateral treaties," he said.