If anyone were in Nunes’s position, he or she might doubt that the new Trump administration could fully trust Director Comey or others in the intelligence agencies to provide disinterested appraisals of such information, given that a number of intelligence officials may themselves, in theory, have been involved in the intercepts and their dissemination. He might advise that any possible sources connected even remotely to the White House should have disclosed the existence of such information to his boss. Nor would he necessarily believe that Representative Adam Schiff (D., Calif.) would be a reliable partner on the intelligence committee. Would...