If former White House Counsel Don McGahn honors a congressional subpoena, he'll appear before the House Judiciary Committee today. In theory, the Republican lawyer has some extremely important information to share.
In fact, McGahn is a witness of particular significance: few figures play as important a role in the Mueller report as the former White House counsel. As we've discussed -- and as Donald Trump has acknowledged -- the Republican lawyer spoke with investigators for dozens of hours, and in the redacted version of Mueller's report, the former White House counsel is cited more than 150 times.
In some of the episodes in which Trump allegedly obstructed justice, the claims of suspected criminal misconduct are based heavily on what McGahn told investigators.
Indeed, as the special counsel's findings made clear, the former White House counsel very nearly resigned because the president directed him to "do crazy s**t," including an incident in which, according to McGahn, Trump pressed the lawyer to push the Justice Department to derail the investigation by getting rid of Mueller and creating a false document to cover that up.
McGahn is not, however, expected to show up on Capitol Hill today.
President Donald Trump has directed former White House counsel Don McGahn to defy a congressional subpoena and not testify Tuesday, current White House counsel Pat Cipollone said Monday.
In a letter to House Judiciary Chairman Jerrold Nadler, D-N.Y., Cipollone wrote that the Justice Department "has advised me that Mr. McGahn is absolutely immune from compelled congressional testimony with respect to matters occurring during his service as a senior adviser to the President."
McGahn's lawyer soon after informed the committee that his client would not testify.
The result is a rather extraordinary set of circumstances: the former White House counsel may be in a position to shed light on the president's alleged crimes, but the president has ordered him not to answer any questions, even if that means defying a lawful subpoena.
The next question, of course, is what's likely to happen next.