President promises Secretary that he will appoint him to the next vacant judgeship in his administration. When the vacancy opens, it is that of the Chief Justice of the United States. President decides to appoint Senator instead to become Chief Justice. Secretary sues in federal court claiming that the President promised him the next vacancy. A reviewing court should find for:
a) President, as the appointment power is a discretionary authority
b) Secretary, as a promise made by the President should be legally binding
c) Senator, as the President has the authority to choose any nominee
d) None of the above, as this is a political question outside the judiciary's purview