Based on the type of government intended by the Constitution, the government is expected to protect individual liberty. As Marshall says, "[The government] will certainly cease to deserve [to be termed a government of laws, and not of men] if the laws furnish no remedy for the violation of a vested right." However, with this assertion Marshall established the power of the Supreme Court to review actions of the executive branch - a power that does not stem directly from the Constitution.
The third and final question which Marshall addressed was whether Marbury "is entitled to the remedy for which he applies." Marshall further divides this question into two parts: the nature of the writ and the power of the Supreme Court. In examining the nature of the writ, Marshall solidifies further the Supreme Court authority over members of the executive branch. Marshall admits that "the officer to whom [the writ] is to be directed, must be one to whom, on legal principles, such writ may be directed . . . " and that the Supreme Court cannot "enquire how the executive, or executive officers, perform duties in which they have discretion." Yet Marshall insists that the Supreme Court can issue a mandamus "[where the head of a department] is directed by law to do a certain act affecting the absolute rights of individuals." This assertion does not have Constitutional basis. The Constitution does not expressly grant the Supreme Court power over either of the other branches of government. .
Finally Marshall gets to the question based on which he decides the case - the Supreme Court's jurisdiction over this case. For the first time in this case, Marshall uses direct constitutional basis to make his ruling. He argues that, "If it had been intended to leave it in the discretion of the legislature to apportion the judicial power between the supreme and inferior courts according to the will of that body, it would certainly have been useless to have proceeded further than to have defined the judicial power .