If the Supreme Court of the United States had issued the writ of mandamus, how could it have forced Madison to comply with the order? What would have happened if he had ignored it? (In other words, does the Court have enforcement power?)

The Marbury v. Madison case introduced the diffuse control model of constitutionality of law, the judicial review, into modern constitutionalism, building on the United States Supreme Court the principle of constitutional supremacy.

The Court does not have enforcement power.