In her public order Tuesday, Presiding Judge Rosemary Collyer of the Foreign Intelligence Surveillance Court didn’t mention Robert Mueller. But her stinging rebuke of the FBI for abusing the FISA process to obtain a warrant to spy on Carter Page invites the question: How could the special counsel have ignored the Steele dossier?

Inspector General Michael Horowitz confirms the FBI sought to verify the claims former British spy Christopher Steele made in his dossier. Yet during an appearance before the House Intelligence Committee...