Somin quotes his own previous description of the "unitary executive":
The idea of the unitary executive is simply that whatever power the executive branch has should be concentrated in the hands of the president. There can be no executive officials (such as the independent counsel) who are not subject to presidential control and removal. As Article II of the Constitution states, "the executive power [of the federal government] shall be vested in a President of the United States." It does not grant any executive authority to officials not under presidential control.
Whether this is right or not, and I think it is wrong for the purposes used (indeed, given the Spending Power and the Confirmation Power, to me it is self evidently wrong), but that is not what we mean when discussing the Unitary Executive in the Bush Era. As Somin knows, the phrase has come to mean the opposite of this:
[T]he scope of executive power is relatively narrow, and that the president has no authority to ignore laws enacted by Congress, including those that constrain many military and foreign policy decisions. Congress can pass a variety of laws stating that no one in the executive branch - including the president - can do X....
I took on this very point during the Alito SCOTUS confirmation hearings:
"Some Conservatives continue to argue that Democrats misunderstand the "unitary executive" theory, saying it does not mean unfettered Presidential power. I suggest they immediately inform the Bush Administration,
they say otherwise:
In a speech to the Federalist Society in 2001, Alito said:
When I was in OLC [] . . ., we were strong proponents of the theory of the unitary executive, that all federal executive power is vested by the Constitution in the President. And I thought then, and I still think, that this theory best captures the meaning of the Constitution's text and structure . . . ." "[T]he case for a unitary executive seems, if anything, stronger today than it was in the 18th Century.
What does that mean? Here's what it means for Bush:
The executive branch shall construe Title X in Division A of the Act, relating to detainees, in a manner consistent with the constitutional authority of the President to supervise the unitary executive branch and as Commander in Chief and consistent with the constitutional limitations on the judicial power, which will assist in achieving the shared objective of the Congress and the President, evidenced in Title X, of protecting the American people from further terrorist attacks.
The Bybee Memo put it this way:
Any effort by the Congress to regulate the interrogation of battlefield combatants would violate the Constitution's sole vesting of the Commander in Chief authority in the President. . . . Congress can no more interfere with the President's conduct of the interrogation of enemy combatants than it can dictate strategic or tactical decisions on the battlefield.
Alito did NOT disavow this view of an unfettered Presidential power - of the President as King. I think if Alito does not want to "confuse" Conservatives on this, he should have said expressly that he does not agree with Bush. He didn't.
Somin's argument seems to be for some otherworldly place where the Bush Administration does not exist. It has nothing to do with the current political debates.
Speaking for me only