I will be happy to comment on the motives.
The GOP does not like the negotiations with Iran, because they think it might result in some give-away to Iran. Bibi is going to make the case that we not do anything like that.
I could be hugely cynical, and say they are actively attempting to sabotage something that might actually be successful, in order to not give Obama a foreign policy success.
Given what I see as rather craven partisanship on the part of the GOP in congress, and yes, Democrats do stupid too, I sadly can't rule out the more cynical guess at their motives. I think the GOP has gone into hysterical Obama hate mode at this point, in the run up to the 2016 elections. Everything happening in congress on both sides is going to be almost pure political theater.
Sad that when the GOP are given keys to the car, they don't see duty to country over duty to party as their priority. To be fair, I wish Democrats would do more of that, because it makes it far easier to credibly argue there is a difference between the parties to independents. Neither side is completely guiltless when it comes to this, of course, but the tea party extremists that are trying to grab the steering wheel from the establishment GOP are not going to let the GOP do that any time soon.
http://www.realclearpolitics.com/vid...ar_weapon.html
At a joint news conference with German Chancellor Angela Merkel President Obama addressed the ongoing nuclear negotiations with Iran. According to the Supreme Leader of Iran, said Obama, "it would be contrary to their faith to obtain a nuclear weapon."
PRESIDENT OBAMA: The issues now are sufficiently narrowed and sufficiently clarified where we're at a point where they need to make a decision. We are presenting to them in a unified fashion, the P5+1 supported by a coalition of countries around the world are presenting to them a deal that allows them to have peaceful nuclear power but gives us the absolute assurance that is verifiable that they are not pursuing a nuclear weapon.
And if in fact what they claim is true, which is they have no aspiration to get a nuclear weapon, that in fact, according to their Supreme Leader, it would be contrary to their faith to obtain a nuclear weapon, if that is true, there should be the possibility of getting a deal. They should be able to get to yes. But we don't know if that's going to happen.