What Happens if Senate Rejects the Iran Nuclear Treaty?

I saw this Op-Ed by Joseph Cirincione in today's LA Times, and I think I agree with his convincing arguments. What do you think?   I believe the world needs this treaty.  My feeling is reinforced when I see that the "big money" right-wingers are spending millions of dollars on paid advertising against the treaty and distorting the facts. (see this link or this one).  I suspect that Israel or their supporters are behind the paid advertising, using, in some way, some of the billions of dollars that US taxpayers have "donated" to their country.  Meanwhile, Israel maintains their own WMD including nuclear, chemical and possibly biological weapons, and is the only Middle East country who has attacked US naval ships (see this link) and routinely spies on the US (John Pollard, for example). Israel likes to say they are our friend and ally, but never provided any serious support when we needed help in Vietnam, Bosnia, Iraq, or Afghanistan. Why should the US demand inspection of Iran's nuclear processing and weapons, when we don't do the same for Israel's?
Of course Iran should be angry with the US, we have severly mistreated Iran throughout history.  Of course Iran should want nuclear weapons.  All of their neighbors (Pakistan, India, Russia) as well as Israel have them.  Also Israel has assassinated Iranian scientists and their family when traveling outside of Iran (I don't know of any case when Iran has done the same to any Israeli scientists), and Israel launched an unprovoked cyber attack against Iran's nuclear processing industry.  I don't know of any case where Iran has launched any attack of any sort against Israel.  Those were clearly terrorist acts done by Israel, but Israel claims that Iran sponsors "state terrorism"...