I would be deeply offended, if I was Jewish. Hell, I'm deeply offended and I'm NOT Jewish. This is a perpetuation of the antisemitic myth that American Jews primary loyalty is to some other country because of their religion. That's like saying Catholics are loyal to the Pope, so they can never be trusted in public office.
Actually, it really is the case for Republicans: They think it's all right to lie, when it benefits their Party. Therefore, they are unfit for public office. Trump is projecting once again: Anything he accuses enemies of, is probably something he has done or is doing right now.