The special counsel regulations were written to provide the public with confidence that justice was done. It is impossible for the public to reach that determination without knowing two things. First, what did the Mueller report conclude, and what was the evidence on obstruction of justice? And second, how could Mr. Barr have reached his conclusion so quickly?

Mr. Barr’s letter raises far more questions than it answers, both on the facts and the law.

His letter says Mr. Mueller set “out evidence on both sides of the question and leaves unresolved what the special counsel views as ‘difficult issues’ of law and fact concerning whether the president’s actions and intent could be viewed as obstruction.” Yet we don’t know what those “difficult issues” were, because Mr. Barr doesn’t say, or why Mr. Mueller, after deciding not to charge on conspiracy, let Mr. Barr make the decision on obstruction.

On the facts, Mr. Barr says that the government would need to prove that Mr. Trump acted with “corrupt intent” and there were no such actions. But how would Mr. Barr know? Did he even attempt to interview Mr. Trump about his intentions?

What kind of prosecutor would make a decision about someone’s intent without even trying to talk to him? Particularly in light of Mr. Mueller’s pointed statement that his report does not “exonerate” Mr. Trump. Mr. Mueller didn’t have to say anything like that. He did so for a reason. And that reason may well be that there is troubling evidence in the substantial record that he compiled.

Furthermore, we do not know why Mr. Mueller did not try to force an interview with the president. The reason matters greatly. Mr. Mueller could have concluded that interviews of sitting presidents for obstruction matters are better done within the context of a congressional impeachment investigation (perhaps because a sitting president cannot be indicted, the Barr letter says this legal argument didn’t influence Mr. Barr’s conclusion but again is pointedly silent as to Mr. Mueller).