U.S. District Judge Amy Berman Jackson needed only one week to deliver cutting ripostes to both sides of one of the most closely watched separation-of-powers cases in Washington.

First up: U.S. Department of Justice attorneys. They wanted Jackson to dismiss a lawsuit against Attorney General Eric Holder Jr. brought by the House Committee on Oversight and Government Reform. The suit, filed last year, seeks enforcement of the committee’s subpoena targeting documents related to the Operation Fast and Furious gun-running controversy.