Airs Sunday, January 4 at 6 p.m. Some say that indiscriminate collection of U.S. phone records is a gross invasion of privacy. Others say that it is necessary to keep us safe. But what does the U.S Constitution say? Is collection of phone records a “search” or “seizure?" If so, is it “unreasonable?" Does it require a particularized warrant and probable cause? These are among the most consequential — and controversial — constitutional questions of our time. Arguing for the motion are Alex Abdo, Staff Attorney for the ACLU's Speech, Privacy and Technology Project; and Elizabeth Wydra, Chief Counsel for the Constitutional Accountability Center. Arguing against the motion are: Stewart Baker, Former Assistant Secretary for Homeland Security & Former General Counsel for the NSA; and John Yoo, a Professor of Law at UC Berkeley & Former Justice Department Lawyer.