Since Brexit, the UK no longer has a data-sharing agreement with many countries in the EU, making it more difficult to check criminal and immigration records of asylum seekers, according to Lucy Moreton of the Immigration Services Union.
"If we were able to share databases, even if just with our nearest neighbours, with Germany, with Belgium, with Holland and France, say - then, yes, we'd know that they had a conviction for people smuggling," she said.
"Taking back control of our borders"