washington immigration advocate thursday mount long-shot effort revive part u.s. president barack obama plan shield millions immigrants deportation file lawsuit challenge national scope court order block favorable court rule lawyers file lawsuit say long-term potential unravel decisions block obama november 2014 plan nationwide white house program fully implement could allow four million people legal immigration status obtain work authorization lawsuit file federal court new york behalf martin batalla vidal 25 immigrant mexico live unite state since seven benefit program initially receive three-year work authorization revoke due texas judge rule february 2015 block obama plan texas 25 state challenge vidal would still eligible two-year work authorization early program challenge cover injunction vidal lawyers national immigration law center say win rule could broad implications could help eventually reinstate obama program 60 percent potential applicants part country cover texas rule texas judge rule uphold appeal june 23 supreme court deadlocked 4-4 case leave appeal court decision place court currently one justice short follow death justice antonin scalia february supreme court currently consider whether rehear case full complement justices lawsuit open new front obama immigration legal fight