washington u.s. president donald trump say thursday end so-called chain migration allow legal immigrants apply relatives abroad come unite state would part legislation help young immigrants bring country illegally children yes part daca deal trump say interview fox news channel refer defer action childhood arrivals program benefit young immigrants trump end program march 2018 think republican would vote anything leave chain migration chain migration disaster country horrible say add fund wall border mexico would also part daca deal trump say end chain migration part daca deal fox interview