Unauthorized immigrants the White House deems the "worst of the worst" may stay at U.S. facilities in Guantanamo Bay, Cuba until they can be repatriated to their countries of origin, Trump Border Czar Tom Homan told Fox News on Sunday.

"The worst of the worst need to go to Guantanamo Bay," Homan told the U.S. cable news channel. "We've had a migrant processing center there for decades... We're going to expand it a lot."