No, Chafetz, a professor at Cornell Law School, is not making his case in partisan terms. He argues that Congress has failed to make sufficiently vigorous use of its powers under the Constitution, thus inviting the executive and the judiciary to fill the resulting vacuum. For much of the last century, this was a case advanced by political conservatives. More recently, the right has become associated with advocating the expansion of executive power, though it’s not clear to me that there is any inevitable ideological association there.