John 18:30

The spokesmen for the Jews eventually evaded Pilate’s question. Luke recorded that they initially charged Jesus with misleading Israel, with forbidding the Jews to pay their taxes to Caesar, and with claiming to be Israel’s king (Luke 23:2). However they could not impress Pilate with those charges sufficiently.

They hesitated to bring the charge of blasphemy against Jesus because Pilate might dismiss it as unworthy of his consideration (cf. Acts 18:12-16). They evidently did not accuse Him of treason because this too would have incited His many followers, and they would have had difficulty proving it. Consequently they did not name the charge but assumed that it was serious and implied that Pilate should trust them and "rubber stamp" their decision. Perhaps the fact that Pilate had provided troops to arrest Jesus encouraged them to think that he had already judged Jesus guilty. They did not appreciate Pilate’s question since it suggested that they would have to go through a formal trial from beginning to end.

"It is possible that they were taken by surprise at Pilate’s indication that he would try the case himself. They had had his cooperation in making the arrest; now they apparently expected that he would take their word for it that the man the Romans had helped to arrest was dangerous and should be executed." [Note: Ibid., p. 676.]

Pilate realized that the Jewish leaders had determined to do away with Jesus (cf. Matthew 27:18), but he had no evidence that Jesus had done anything worthy of death.