At Volokh Conspiracy, Ilya Somin: Is the Iran deal constitutional? (following up on my post here). This is a key point:
In the slightly longer run, however, the constitutional objections to the agreement might make it easier for a future administration to repudiate it. Opponents of the deal could potentially begin laying the groundwork for such a move by taking the position that it will not be legally binding unless and until it gets affirmative congressional approval.
At least, the administration should be pressed to explain why it thinks the deal is constitutional. (I have not seen an official defense, if there is one.)
Posted at 6:09 AM