Fanatics can justify any action, and House Intelligence Chairman Adam Schiff this week demonstrated where that mindset leads. In his rush to paint Donald Trump as a lawbreaker, Mr. Schiff has himself trampled law and responsibility.

That’s the bottom line in Mr. Schiff’s stunning decision to subpoena the phone records of Rudy Giuliani and others. Mr. Schiff divulged the phone logs this week in his Ukraine report, thereby revealing details about the communications of Trump attorneys Jay Sekulow and Mr. Giuliani, ranking Intelligence Committee member Devin Nunes, reporter John Solomon and others. The media is treating this as a victory, when it is a disgraceful breach of ethical and legal propriety.

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If nothing else, Mr. Schiff claims the ignominious distinction of being the first congressman to use his official powers to spy on a fellow member and publish the details. His report also means open season on members of the press. Mr. Giuliani over months has likely spoken to dozens of political figures and reporters—and the numbers, dates and length of those calls are now in Democrats’ hot little hands. Who gets the Schiff treatment next? If you think politics is ugly now, imagine a world in which congressional partisans routinely track and expose the call lists of their political rivals and disfavored media.

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If we’ve never had a scandal like this before, it’s in part because it is legally dubious. Federal law bars phone carriers from handing over records without an individual’s agreement. The statute makes some exceptions, including for federal and state law-enforcement agencies.

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