Deuteronomy 17:14

When thou art come, etc.] Similarly Deuteronomy 18:9; Deuteronomy 26:1; cp. Deuteronomy 6:10; Deuteronomy 7:1.

I will set a king … like as all the nations, etc.] 1 Samuel 8:5: make us(the same verb) a king to judge us like all the nations. Cp. 1 Samuel 12:12, where the example of the Ammonites is given as the motive of Israel's desire, although Jehovah your God is your King. Evidently D is doubtful of the advantages of the monarchy. Like so much else in the code this law is a concession to existing facts.