What does Luke 23:6 mean?

The Sanhedrin has gathered a crowd and is pushing Pilate to convict Jesus of a capital crime against Rome. Their argument is weak. They claim that Jesus is a threat to Pilate's ability to collect taxes—which is a lie—and his ability to keep the peace—which is unproven. They also say that Jesus claims to be the king of the Jews which places Him in rebellion against Caesar (Luke 23:1–2).

Pilate doesn't believe any of it. He can play the paranoid Roman leader as well as any other and he sees no threat in Jesus' actions except against the Jewish leaders (Matthew 27:18; Luke 23:4). But when they mention Jesus riles up the people in Galilee, he sees his chance. Herod Antipas, tetrarch of Galilee and Perea, is in Jerusalem. If Jesus is guilty of crimes against the Rome-authorized leadership, it will be in Galilee, not Judea. Pilate sends Jesus to Antipas who has wanted to talk to Jesus since he first heard of Him (Luke 9:7–9; 23:7–8).

Herod Antipas is the son of Herod the Great, who ordered the deaths of the baby boys in Bethlehem shortly after Jesus' birth (Matthew 2:16–18). His mother is Malthace, a Samaritan woman. Herod the Great's father was an Edomite—a descendant of Esau (Genesis 36:1)—whose people had converted to Judaism some time before. He was raised as a Jew. The Herods consider themselves Jewish in terms of religion and culture, if not strictly genetically. So, it's expected that Antipas would be in Jerusalem for Passover.