wordsworth

Dowling, in Cases on Constitutional Law, concludes his review of Marbury v. Madison by drawing this quote from Massachusetts v. Mellon:

The functions of government under our system are apportioned. To the legislative department has been committed the duty of making laws; to the executive the duty of executing them; and to the judiciary the duty of interpreting and applying them in cases properly brought before the courts. The general rule is that neither department may invade the province of the other and neither may control, direct or restrain the action of the other. We are not now speaking of the merely ministerial duties of officials. Gaines v. Thompson, 7 Wall. 347. We have no power per se to review and annul acts of Congress on the ground that they are unconstitutional. That question may be considered only when the justification for some direct injury suffered or threatened, presenting a justiciable issue, is made to rest upon such an act. Then the power exercised is that of ascertaining and declaring the law applicable to the controversy. It amounts to little more than the negative power to disregard an unconstitutional enactment, which otherwise would stand in the way of the enforcement of a legal right. The party who invokes the power must be able to show not only that the statute is invalid but that he has sustained or is immediately in danger of sustaining some direct injury as the result of its enforcement, and not merely that he suffers in some indefinite way in common with people generally. If a case for preventive relief be presented the court enjoins, in effect, not the execution of the statute, but the acts of the official, the statute notwithstanding.

In sum, the Court can only require either the Legislature or Executive to do what they have a ministerial duty to do.