He doesn't mention Hamas, and there's no proof available that the man is a pro-Hamas activist. He has never self-claimed any such thing either.

Also, Durbin is not defending his views. They are defending his right to not be disappeared to another state in ICE custody without being charged with any crimes. All of that cannot be labeled anti-Semitism. By this logic, the ACLU was anti-Semitic for its defense of civil liberties in the Skokie case