what is a political question?

In the leading case of Tanada v. Cuenco,⁹⁸ Chief Justice Roberto Concepcion defined the term "political question," viz:

[T]he term "political question" connotes, in legal parlance, what it means in ordinary parlance, namely,

 a question of policy. 

In other words, in the language of Corpus Juris Secundum, it refers to

 "those questions which, under the Constitution, are to be decided by the people in their sovereign capacity, 

or in regard to which full discretionary authority has been delegated to the Legislature or executive branch of the Government." 

It is concerned with issues dependent upon the wisdom, not legality, of a particular measure.⁹⁹ (Italics in the original) 

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 Truly political questions are thus beyond judicial review, the reason for respect of the doctrine of separation of powers to be maintained. On the other hand, by virtue of Section 1, Article VIII of the Constitution, courts can review questions which are not truly political in nature.