“The Justice Department is widely reported to have offered criminal immunity to Bryan Pagliano, the techie who set up Hillary Clinton’s private email operation. Now that he has that get-out-of-jeopardy-free card, Mr. Pagliano also ought to be able to tell Congress and the public what he knows,” writes the Journal editorial board. “Congress has a unique interest in this testimony. The FBI is presumably not investigating whether Mrs. Clinton or her aides deliberately attempted to evade federal record-keeping or freedom-of-information laws because those statutes don’t include criminal enforcement. Yet the country has a right...