I don't think it contradicts the text of Matt's post, but it's worth noting that the trend towards unilateral executive power is a question of constitutional norms, as opposed to the text of the Constitution. John Yoo's nonsense notwithstanding, the framers were worried about the...
constitutionalism
David Nieporent says:But a right means the government can't stop you from doing something; it doesn't mean that you have some claim on anybody else's wallet to give you that.