No, pointing out someone who is Jewish/Israeli got arrested is not anti-Semitic.
If he said that he was soliciting young girls because he is Jewish, thus implying that all Jews are child molesters as was already done on this thread, that would be anti-Semitic.
But of course the usual suspects have already made actual anti-Semitic posts on this thread.
Lastly, one one seems to have asked the question, other than Hawg, if the guy had diplomatic immunity. If he did, then nothing the US can do except kick him out. Countries rarely wave diplomatic immunity.
"If you will not fight for right when you can easily win without blood shed; if you will not fight when your victory is sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves." - Sir Winston Churchill