How does this king thing work anyway?

The prophets speak on behalf of God to the people, while the kings are called to rule and judge wisely on behalf of the divine King. The prophets are called to stand in the breach on behalf of the sinful people, whereas the kings have the responsibility of protecting the people against earthly enemies (cf. Ps 72). Unlike the prophet, the king’s role is not primarily advocating for the people before the heavenly throne and speaking to the people on behalf of God. In fact, it is interesting to note that God communicates to a person as great and pious as King David through the prophets Nathan and Gad. Having said this, Israel’s kings also intercede occasionally for the people.—Standing in the Breach, page 224