Special counsel John Durham’s inquiry into the Russia-collusion hoax isn’t over. We learned a lot from the trial of Michael Sussmann, despite his May acquittal in the District of Columbia. Mr. Durham’s team revealed that Rodney Joffe, a Sussmann associate who was involved in gathering derogatory information about Donald Trump, was also a confidential source for the Federal Bureau of Investigation.

On Tuesday Mr. Durham started making his case against another FBI confidential source, Igor Danchenko, in Alexandria, Va. Whatever the outcome, the trial will reveal more about how the FBI was misled by informants and in turn misused them.