British Prime Minister David Cameron promised to deport more migrants who enter Britain illegally on Thursday, as hundreds of migrants stranded in the French port of Calais continued efforts to reach the Channel Tunnel linking the two nations, dpa reported. Despite a "very testing" situation, with several thousand migrants hoping to reach Britain from Calais, the country will not become a "safe haven," Cameron told reporters during a visit to Vietnam. Britain and other European nations faced a "swarm of people coming across the Mediterranean, seeking a better life," the BBC quoted him as saying. "But we need to protect our borders by working hand in glove with our neighbours, the French, and that is exactly what we are doing," Cameron said. More illegal immigrants will be deported from Britain, he said, "so people know it's not a safe haven."