b'In March 2015, the American Civil Liberties Union filed a lawsuit challenging the constitutionality of a type of National Security Agency bulk monitoring known as "upstream" surveillance. More than three years after the ACLU originally filed the suit, the case is still mired in procedural and bureaucratic limbo. But on Friday, a hearing over one such roadblock in Maryland district court could bring long-awaited progress.\\nLearn more about your ad choices. Visit podcastchoices.com/adchoices'