I believe it was in Cruz’s great speech at the end of September where he talks about how he tried to stop the Iran Deal because it was against the law. The law being the wording in the Corker Bill that stated congress had to have all of the documents on the Iran Deal in order for congress to be able to review it, and within a certain time frame.
Cruz knew obama wouldn’t get all the documents in for review, (and obama didn’t), so the deal is illegal. Although I guess nobody else thought it was worth “shutting down” the government over.
Now, Trump supporters who deny Cruz' is choice of weapons in combating the Iran deal fashion in secret by Obama and back doored by McConnell/Corker. I do not credit Cruz with foresight, that is knowledge that Obama would not submit side deals, but I do credit Cruz with a calculation that the particulars of the deal could at least be exposed under the Senate legislation and it was perfectly obvious, or at least to be expected, that Obama would proceed as he had threatened, that is, to treat the matter as an executive agreement, submit it to the Security Council of the United Nations as a fait accompli, and tell the Senate the stuff it.
Does anyone believe that Mitch McConnell would take up the Iran deal as a treaty when he had already said that it was the president's choice whether to treat it as a treaty or not? Does anyone believe that they would have been more than two or three senators (Cotton, Cruz, Lee) attempting this hopeless task of making the Senate take up the deal as a treaty?
We hear many ignorant but well-meaning conservatives criticizing Cruz for a tactical decision that was fully defensible, although not one I would have made in hindsight.