decide open questions unless a case decision requires it. If it does, a rule of constitutional law is formulated only as the precise facts in the case require. The Court will choose statutes or general law for the basis of its decision if it can without constitutional grounds. If it does, the Court will choose a constitutional construction of an act of Congress, even if its constitutionality is seriously in doubt. Likewise with the executive department, Edwin Corwin observed that the Court does sometimes rebuff presidential pretensions, but it more often tries to rationalize them. Against Congress, an act is merely "disallowed". In the executive case, exercising judicial review produces "some change in the external world" beyond the ordinary judicial sphere. The "political question" doctrine especially applies to questions which present a difficult enforcement issue. Chief Justice Charles Evans Hughes addressed the Court's limitation when political process allowed future policy change, but a judicial ruling would "attribute finality". Political questions lack "satisfactory criteria for a judicial determination". John Marshall recognized that the president holds "important political powers" which as executive privilege allows great discretion. This doctrine was applied in Court rulings on President Grant's duty to enforce the law during Reconstruction. It extends to the sphere of foreign affairs. Justice Robert Jackson explained, foreign affairs are inherently political, "wholly confided by our Constitution to the political departments of the government ... [and] not subject to judicial intrusion or inquiry." Critics of the Court object in two principal ways to self-restraint in judicial review, deferring as it does as a matter of doctrine to acts of Congress and presidential actions. Its inaction is said to allow "a flood of legislative appropriations" which permanently create an imbalance between the states and federal government. Supreme Court deference to Congress and the executive compromises American protection of civil rights, political minority groups and aliens. Subsequent Courts Supreme Courts under the leadership of subsequent chief justices have also used judicial review to interpret the Constitution among individuals, states and federal branches. Notable contributions were made by the Chase Court, the Taft Court, the Warren Court, and the Rehnquist Court. Salmon P. Chase was a Lincoln appointee, serving as chief justice from 1864 to 1873. His career encompassed service as a U.S. senator and Governor of Ohio. He coined the slogan, "Free soil, free Labor, free men." One of Lincoln's "team of rivals", he was appointed