Neal K. Katyal and George T. Conway III write:

What now seems an eternity ago, the conservative law professor Steven Calabresi published an op-ed in The Wall Street Journal in May arguing that Robert Mueller’s appointment as special counsel was unconstitutional. His article got a lot of attention, and it wasn’t long before President Trump picked up the argument, tweeting that “the Appointment of the Special Counsel is totally UNCONSTITUTIONAL!”

Professor Calabresi’s article was based on the Appointments Clause of the Constitution, Article II, Section 2, Clause 2. Under that provision, so-called principal officers of the United States must be nominated by the president and confirmed by the Senate under its “Advice and Consent” powers.

He argued that Mr. Mueller was a principal officer because he is exercising significant law enforcement authority and that since he has not been confirmed by the Senate, his appointment was unconstitutional. As one of us argued at the time, he was wrong. What makes an officer a principal officer is that he or she reports only to the president. No one else in government is that person’s boss. But Mr. Mueller reports to Rod Rosenstein, the deputy attorney general. So, Mr. Mueller is what is known as an inferior officer, not a principal one, and his appointment without Senate approval was valid.

But Professor Calabresi and Mr. Trump were right about the core principle. A principal officer must be confirmed by the Senate. And that has a very significant consequence today.

It means that Mr. Trump’s installation of Matthew Whitaker as acting attorney general of the United States after forcing the resignation of Jeff Sessions is unconstitutional. It’s illegal. And it means that anything Mr. Whitaker does, or tries to do, in that position is invalid. [Continue reading…]