Archbishop and Pope join forces to tackle slavery
16 June 2014 Last updated at 21:55 BST
The Archbishop of Canterbury, Justin Welby, says the government must be willing to accept immigrants who have been trafficked into the UK, rather than have them deported.
He was speaking to BBC News, after meeting Pope Francis in the Vatican, when the two men committed their churches to act together against human trafficking and slavery.
Robert Pigott reports.