washington u.s. republican presidential nominee donald trump tweet sunday night would make major speech illegal immigration arizona wednesday announcement come day trump say would crack illegal immigrants overstay visa seek clarify view overhaul u.s. immigration system last week trump say soften plan deport 11 million illegal immigrants stance arouse criticism conservatives want stand fast republican presidential nomination large part hard-line position call build wall along u.s. border mexico make major speech illegal immigration wednesday great state arizona big crowd look large venue trump postpone immigration speech originally plan last thursday denver say tweet sunday another tweet sunday night trump say hillary clinton democratic rival nov. election release detail medical record problem hillary speech saturday iowa trump say would seek institute track system ensure illegal immigrants overstay visa quickly remove would propose e-verify system prevent undocumented residents gain access welfare benefit enforce visa expiration date open border simple say trump say first priority take office next january would immediate deportation thousands undocumented immigrants remain unite state despite commit crimes international gang cartels thing past say reign terror task always err side protect american people use immigration law prevent crimes wait innocent american harm kill take action trump explain plan would affect undocumented residents unite state decades obey u.s. laws trump give speech illegal immigration wednesday