The US Congress cut the feet out from under the President when they decided to write and send an open letter saying “we don’t have to stick with anything he negotiates, and probably won’t.”
Arab leaders have no reason to respect or deal with any “leader” who is clearly so powerless. And why spend the time on negotiations which would only be undone in another couple of years?
The irony here is that the Republicans are now cheerfully blaming this on Obama rather than on themselves. It’s the same kind of reasoning which supports ‘sex-ed’ classes telling high school kids that condoms don’t work, and then when teens don’t bother to use condoms and teen pregnancies and STDs soar, turning around and saying “See? The easy availability of condoms doesn’t help prevent this!”