Two high-profile officials who served under the Obama administration told a Senate Judiciary subcommittee on May 8 that they had reviewed classified information in which Donald Trump, his associates, or members of Congress had been unmasked. When an intelligence agency gives transcripts of intercepted communications, it often seals the names of U.S. citizens. When a recipient of an intelligence report requests to have the name revealed, it is referred to as “unmasking.” The testimonies by Sally Yates, the former acting attorney general, and James Clapper, the former director of national intelligence (DNI), raised the question of whether communications of the...