In this case I think the US (or UN) should declare unilaterally the physical national boundaries separating Israel and Palestine. Pretty much every other method has been tried for half a century and it's time to tell these two "this is your side of the room and that is their side" and draw a line down the middle. 1967 borders. No one gets Jerusalem (it is declared international territory and policed by UN troops). Like it or face sanctions by the UN. End of story.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Palestinians: UN recognition would foster peace with Israel