Second, no, I don't agree with you in any way, shape or form that what you suggest is smarter. The existing law of the United States places severe restrictions on Iran to prevent it from being able to obtain a nuclear weapon and also to carry out its myriad terrorist activities. Obama has refused to follow our law on this, as he has on many other of our laws. He is making an agreement with a foreign power that he does not have authority to make final. The Senate has to approve treaties, and it is not acceptable to try to avoid the Senate by going through the UN. If that were possible, as many people have noted, the UN could be used to disarm the US, take any and all of our rights, and even bring peacekeepers into Ferguson. Rubio, Walker and Cruz are not disagreeing on anything. The quote you attribute to Cruz, and I haven't checked to see if he said it, is merely a repetition of the requirements that the President has for any agreement of this type. Walker and Rubio would not disagree with this, they have just read the Obama Regime's statements that this would NOT be submitted to the Senate. As a result of this effort to bypass Congress entirely, it was entirely appropriate for Senator Cotton to notify the Iranians that none of this agreement is binding on the US, and for any person running for President to notify the Iranians, the world and US voters that they won't abide by this horrid deal.
You seem to want Rubio and Cruz to play some kind of game where they demand the agreement be submitted to Congress for a vote, then listen to Obama politely, then vote on it. Obama won't do that, we are capable of understanding the terms ourselves without Obama explaining it to us, we know what Obama's agenda is (for Iran to get a nuke so it can wield more power in the middle east--and against us, too for that matter), and we know that he is working against the US every second of every day with every fiber of his being. There is no need for formalities. Tell the world: IF I AM PRESIDENT, THIS UNENFORCEABLE AGREEMENT WILL BE IGNORED. Then, in 2 years, if we have an election, and if it is fair, and if by God's miraculous will, a conservative wins the Presidency, then it will not be a shock to anyone when the US sends a message to Iran telling them that our sanctions will henceforth be enforced, and we are going to take all efforts to ensure that they never have a nuke, never have ability to have a nuke. Period.
They are doing the exact right thing.
Well said.