The NSA vs the ACLU: one side knows everything. The other has read the Constitution very carefully. Winner gets bragging rights. And shapes the course of history.

On today's show, we'll talk to two of America's foremost experts and advocates about liberty, privacy, and digital security—and the explosive new revelations of omnipresent domestic and global surveillance by the National Security Agency. First, Ben Wizener of the ACLU will tell us about the American Civil Liberty Union's new case: a lawsuit demanding that the Obama administration bring its surveillance activities in line with the law and the US Constitution. And then we go to Margot Kaminski of Yale Law School, who expands the fight from the courts to the halls of Congress and corporate America—and explains exactly how you can help.