It’s antisemitic to blame “The Jews” collectively for handing Jesus to the Romans. The people who handed him over were Jewish, but then, so were Jesus and most of his followers. Most jews at the time, and obviously all jews since then had no involvement in the matter. But there is a long history of blaming all jews for the death of Jesus.
If MTG had said “Jewish leaders” handed Jesus to the Romans, there wouldn’t have been potential antisemitic implications. But she said “the Jews” did it, which can be interpreted as antisemitic.