Democratic presidential candidate Hillary Clinton says that she has "real concerns" over reports that the US government plans to increase the pace at which it deport illegal immigrants.

"Hillary Clinton has real concerns about these reports, especially as families are coming together during this holiday season. She believes it is critical that everyone has a full and fair hearing, and that our country provides refuge to those that need it. And we should be guided by a spirit of humanity and generosity as we approach these issues," said a statement from Clinton's campaign.