I wasn't saying he will do it. I was saying he could.
It seems the the US law was originally the Iran and Libya Sanctions Act [1] and there have been various laws extending it. Apparently they allow the President to waive sanctions on a case-by-case bases.
[1] https://en.wikipedia.org/wiki/Iran_and_Libya_Sanctions_Act
What makes you think he will do any of that besides a belief?