Trump's goal is to "make America great again"....... he's already got people having a problem with that, ready to leave the country, if he becomes President. Their leaving WILL contribute to making America great again!! He seems pretty efficient!!
I know some people who are illegal immigrants, like you said, they're all threatening to leave the country if Trump is elected.
If you come to the US illegally, then you shouldnt be here. Then you should leave and go back to where you came from.