Illegal Space Aliens in the Caravan?

Donald Trump has claimed that there could be "Middle Easterners" in the migrant caravan from Central America.  Trump said "there's no proof of anything, but there could very well be" when pressed by CNN reporter Jim Acosta for concrete evidence that people of Middle Eastern descent or that suspected terrorists were among the group.

By that same logic, there very well could be space aliens "mixed in" with the caravan.  There's no proof of anything, but there could very well be.