Obama has been told point blank by his military advisers that support for Israel is bad for the US and that if the Arab/Israel situation is not resolved by negotiation so that everyone is somewhat happy the US will be dragged into a massive ME war that it will lose. Obama is trying to prevent that massive war which will destroy the US economy. Obama knows that Israel is on the path to destruction and wants to minimize the damage to the US.
Iran deal opposition grows among U.S. Republicans, Reuters poll shows (Reuters)
from the article: Gallup poll: U.S. Jewish support for Obama on the decline