Acts 28:21-22

It may be that the Jewish leaders were being completely honest and straightforward with Paul in what they said. If so, God had miraculously kept these Jews from hearing about Paul’s case since Jews in Jerusalem and Rome communicated frequently with each other.

"Very possibly the Jews in Rome preferred to remain ignorant of the case; they would not have forgotten that earlier disputes over the Messiah had led to their temporary expulsion from the city (Acts 18:2 note)." [Note: Marshall, The Acts . . ., p. 423.]

Perhaps the Jewish leaders realized that Paul’s release was inevitable since the Jews had no real case against him in Roman courts. They may have decided to start from scratch in their campaign to do away with him. In any case, they were eager to hear what Paul had to say.