We are told that Mr. Trump cannot be allowed to have any say over the Justice Department’s actions, since this might make him privy to sensitive details about an investigation into himself. We are also told that Congress—a separate branch of government, a primary duty of which is oversight—cannot be allowed to access Justice Department material. House Intelligence Committee Chairman Devin Nunes can’t be trusted to view classified information—something every intelligence chairman has done—since he might blow a source or method, or tip off the president.

That’s a political judgment, but it holds no authority. The Constitution set up Congress to act as a check on the executive branch—and it’s got more than enough cause to do some checking here. Yet the Justice Department and Federal Bureau of Investigation have spent a year disrespecting Congress—flouting subpoenas, ignoring requests, hiding witnesses, blacking out information, and leaking accusations.

Senate Judiciary Chairman Chuck Grassley has not been allowed to question a single current or former Justice or FBI official involved in this affair. Not one. He’s also more than a year into his demand for the transcript of former national security adviser Mike Flynn’s infamous call with the Russian ambassador, as well as reports from the FBI agents who interviewed Mr. Flynn. And still nothing.