Eh? What issue? He’s being anti-Israel.
The way I see it, he's asking for both Israel and the U.S. to live up to the agreements both nations signed back in the 1990s.
The U.S. should distance itself from that whole mess completely. One caveat I would offer is that I would be fine with the U.S. getting involved if both sides ask for us to serve as some kind of intermediary -- much like the U.S. role in the Camp David accords between Israel and Egypt.