If the latest impeachment push continues to backfire, Democrats can thank their duplicitous House Intelligence chairman, Adam Schiff.

The New York Times reported this week that the “whistleblower” who set off the latest inquisition provided an “early warning” to Mr. Schiff’s committee that he or she was filing a complaint over Donald Trump’s July 25 call to Ukraine’s president. The media is now at pains to stress that whistleblowers do sometimes reach out to Congress, that all “procedures” were followed, and that what really...