"If, as some suggest, it's about moving the border to the other side of the Channel, we'll have to put boats out to save all the people in the water," he warned on Friday.

At the "jungle", many think Brexit could help migrants' attempts to reach the UK.

Tensions have mounted in recent days as numbers swell. Last Monday, around 400 migrants clashed with riot-police as they hurled rocks, tree trunks, mattresses and traffic cones to block UK-bound lorries trying to enter the port in the hope of boarding the trucks.

Jan, 27 from Afghanistan, who worked in radio before he fled the war-torn country, said: ‘Everything is very tough now they don’t let people go to the UK but if the UK is out of the EU, France is going to say: “Bye bye. You are out then take your refugees."

"They can’t stop immigration, people will find another way, people will just go from somewhere else."

Adam, 20, from Darfour in Sudan said that while he thought that it would be better for Britain to remain in the EU, migrants might benefit from Brexit.`

"It might be good for us as currently people have their fingerprints taken in other EU countries and if they reach England can be sent back to that country (via the Dublin treaty). When Britain leaves, then they will no longer be the case."