CNN reports that an FBI attorney tampered with documents related to the Carter Page application. How much does it matter? Is this the tip of a scandalous iceberg? Or is it a signal that Inspector General Michael Horowitz’s much anticipated report on investigative irregularities in the Trump-Russia probe will be much ado about nothing much? A low-ranking FBI lawyer altered a document that was somehow related to the Obama Justice Department’s application to the Foreign Intelligence Surveillance Court (FISC) for a national-security surveillance warrant. The application, approved by the FISC in October 2016, targeted former Trump campaign adviser Carter Page...