United States v. Ehrlichman

Five federal agents (defendants) broke into psychiatrist Dr. Lewis Fielding's office without a warrant to obtain the medical records of Daniel Ellsberg, then under federal indictment for leaking classified information, and were indicted for conspiring to violate Fielding's Fourth Amendment rights. Before trial, the agents sought discovery of classified national-security information to show either that the President had authorized the break-in or that enough national-security information was available to them at the time to form a good-faith, reasonable belief the break-in was lawful and served national security; they also moved to dismiss given the risk of exposing classified material.