After marveling at the lede of this new Washington Post bombshell – Mueller investigating Trump for obstruction of justice – I went back and read the whole piece again. You would think that news would be enough for a single piece. But when you read it all the way through the picture it paints is actually considerably more dire.
One key point is that Mueller did not start this obstruction investigation. According to the Post, that probe began “days after Comey was fired on May 9…” Mueller was appointed on May 17th. Reading the Post piece closely, I do not think it explicitly says that the probe began prior to the 17th. But the wording and logic of the piece strongly suggests that is the case.