as long as this provision remains, innocent american citizens are in danger of being detained by police unless they carry immigration papers with them at all times. shepard: , arizona s immigration law will likely face more challenges in the weeks and months ahead. and five other states have also passed legislation similar to that in arizona. so today s ruling doesn t end the fight. far from it. it doesn t mark the end of one significant showdown. and now we have team fox coverage. ed henry on president obama s strategy and reaction. carl cammeron on the governor romney reaction. first, to shannon bream live at the supreme court with details on the ruling. shannon, explain more about why the justices ruled the way they did. well, the majority of the justices came together in an opinion authored by justice anthony kennedy. the bottom line on the three provisions they struck down were that those provisions were preempted by federal law. federal immigration law and enforcement is up