Congress recently put off its reform of surveillance laws until summer amid the pandemic. Justice Department Inspector General Michael Horowitz has now provided more support for action with a report this week finding even more FBI surveillance abuses.

Mr. Horowitz in December released the devastating findings of his investigation into the FBI’s probe of the 2016 Trump campaign, in particular the bureau’s corruption of a secret court process to spy on former Trump aide Carter Page. The IG found the FBI had duped the court,...