Cameron was accused of scaremongering yesterday when he said leaving the EU would lead to the deal being scrapped – and the refugee and migrant camps in Calais relocating to southern England as a result.
A French interior ministry source however pointed told the Daily Telegraph newspaper that Interior Minister Bernard Cazeneuve and said he had “no plans” to change the agreement in the event of a Brexit.
Mr Cazeneuve had explicitly ruled out changing the border agreement and said such a move could lead to a humanitarian disaster.
In what is being described as a scare tactic, the British government yesterday said that a British EU exit could mean thousands of migrants landing on Britain's shores "overnight”.
“A "Brexit" could undermine a Franco-British bilateral agreement that allows Britain to carry out border checks on French soil, stopping many migrants,” David Cameron’s spokesman said.
"Should Britain leave the EU there's no guarantee those [border] controls would remain in place.
"If those controls weren't in place there would be nothing to stop thousands of people crossing the Channel overnight and arriving in Kent (southeast England) and claiming asylum," he said.
The Le Touquet border treaty was signed in 2003 by the then British and French interior ministers David Blunkett and Nicolas Sarkozy following a series of riots at the Sangatte migrant camp near Calais.
The treaty allowed for joint British and French border controls in Channel ports in France.