Barr’s own Section 600.9(a)(3) notification to the judiciary committees—which presumably Mueller will have drafted in large part—can be, and should be, a comprehensive account of the Russia investigation, consistent with Barr’s promise to senators in connection with his confirmation hearing that because “it is very important that the public and Congress be informed of the results of the Special Counsel’s work . . . my goal will be to provide as much transparency as I can consistent with the law.”

That report might well reveal a great deal of factual information about President Trump’s actions involving Russia. We should not expect it, however, to include Mueller’s assessment about whether there are grounds to ask a grand jury to bring criminal charges against Trump after he leaves office, nor to offer any conclusions about whether Trump’s conduct did or did not satisfy the elements of any particular criminal offenses.

Accordingly, as long as Trump is in office it will be up to the committees themselves—and Congress as a whole—to (in the words of the Jaworski road map) “determine what action may be warranted . . . by [the] evidence” presented in Barr’s notification.