In 1 Samuel 8 the people of God ask for a king because they long to be "like all the nations" (8:5; NKJV).
1. They already had a king: "...when the LORD your God was your king" (1 Samuel 12:12; NKJV)
2. He never wanted them to be "like all the nations" (see Exodus - Deuteronomy)
Jason Cicero