We Just Got a Rare Look at National Security Surveillance. It Was Ugly.

WASHINGTON — When a long-awaited inspector general report about the F.B.I.’s Russia investigation became public this week, partisans across the political spectrum mined it to argue about whether President Trump falsely smeared the F.B.I. or was its victim. But the report was also important for reasons that had nothing to do with Mr. Trump.

At more than 400 pages, the study amounted to the most searching look ever at the government’s secretive system for carrying out national-security surveillance on American soil. And what the report showed was not pretty.