Treasury Secretary Jacob J. Lew has an op-ed piece in support of the Iran deal that will be published in the New York Times on Friday. His whole argument rests on the fact that rejecting it means we need to put sanctions on trading partners too.
That's it. That is his whole argument.
Doing so would be bad economically for us but we don't have to do that if the deal is rejected.
That is a straw man.