President Trump delivers remarks at the White House on Friday. (Jabin Botsford/The Washington Post)

When the subject of Attorney General William P. Barr comes up these days, it’s hard not to think of John S. McCain. Not the late senator, mind you, but the USS John S. McCain, the naval destroyer named after his father and grandfather.

It was an incident involving this ship that, as much as anything else, captures how the Trump administration — and its attorney general — operates. It explains Barr’s intervention into the criminal sentencing of Trump’s longtime friend and adviser, felon Roger Stone, and much, much more.