When it comes to Israel, it is always a "delicate issue"

"The United States faces a politically delicate issue in supporting such a resolution because of the disputed Golan Heights, which have been claimed by both Syria and Israel for four decades, so any inquiry into Syrian territory could potentially implicate Israel. Diplomats said the proposed draft language bypasses that quandary by specifying accountability for war crimes only since March 2011, when the Syrian conflict began."