that's the obama era program shielding hundreds of thousands of undocumented young adults from deportation. cnn's supreme court reporter is joining us now. what is this you know ruling ultimately going to come down to? and why is it so many want to make sure they're there to witness it. >> well, the fate of some 700,000 recipients are on the line here. that's the obama era program that gave these protections to young people brought here as children. said come out from the shadows, give us some information, you will have work protections. the trump administration moved to terminate i. that was immediately challenged in the lower courts and the lower courts said no. this has to continue for now. pending appeal. the trump administration went to the supreme court and the supreme court sat on it for months last term and finally decided to take it up and it's going to be heard on tuesday. the trump administration says