washington several u.s. state immigrant advocacy group vow tuesday fight president donald trump decision end program protect people bring illegally unite state children deportation legal experts say challenge face uphill battle democratic state attorneys general california new york washington massachusetts say sue defend obama-era policy know defer action childhood arrivals daca immigrants know dreamers go court defend daca fight dreamers say massachusetts attorney general maura healy state say legal claim trump administration tuesday announce would phase program urge congress enact immigration reform want protect daca recipients nl2n1lm0ht whatever lawsuit democratic state file win easy say jonathan adler law professor case western reserve university college law daca create legally enforceable right certainly create right indefinite presence country say one immigrant group national immigration law center already file court paper seek block trump administration action amend exist lawsuit pending new york case file last year behalf daca recipient martin batalla vidal immigrant mexico come unite state 7. originally contest rule enjoin program former president barack obama offer protection undocumented parent u.s. citizen children new file vidal lawyers outline two-prong challenge trump daca action one claim move violate federal administrative procedure act law require government agencies follow set process make major policy change batalla vidal lawyers say trump announcement abrupt policy shift affect nearly 800,000 program participants assume protections would remain place trump promise presidential campaign dismantle daca since take office january take soft tone lawyers note tell daca recipients would take care file also assert new policy discriminatory substantially motivate animus president administration toward latinos mexicans stephen yale-loehr immigration law professor cornell law school say litigation trump action face multiple obstacles among fact court generally deferential immigration action executive branch areas immigration touch sovereignty national security add u.s. state immigrant group fight trump 's dreamer decision