Democrats are trying to convince Americans that President Trump should be ousted for trying to “dig up dirt” on a rival. They’d have more credibility if they didn’t abuse their surveillance powers for drive-by smears of Republicans and a free press.

Adam Schiff’s 300-page House Intelligence impeachment report doesn’t include much new about Mr. Trump’s Ukrainian interventions. But it does disclose details of telephone calls between ranking Intelligence Republican Devin Nunes, Trump attorneys Rudy Giuliani and Jay Sekulow, reporter...