whether or not police questions people s immigration status based on reasonable suspicion. joining us to talk about immigration ruling and what it means is our senior legal analyst jeffrey toobin and white house correspondent jessica yellin. jeffrey, please start off by saying what the court accepted and rejected. well, the heart of the case is about state power versus federal power. immigration is an area that is traditionally one where the federal government exercises most of the power, but in this case, arizona, as we all now know passed sb-1070 which established certain new requirements to attempt to keep illegal immigration out of arizona. and what the court did was they evaluated four provisions of the law, and they said three of them were unconstitutional, because they conflicted with federal law, but the one they upheld, the one they allow ed to go forward is the most controversial and perhaps the most important of the four. it is nicknamed the show us your papers