Quote Originally Posted by wufwugy View Post
In this case, congress is the dad and the executive is the son. Granted, the president has more power than the son so the analogy isn't perfect. The point is that the executive does not wield lawmaking power. He executes the law he is given by congress; hence the name. If he were to strike a deal with Iran, congress could pass a law saying it's illegal just fine. This letter is simply members of congress stating that fact.
Are you saying that it's congress who is negotiating and not president Obama?