Chris Murphy actually said...

"So your understanding is their commitment is upon our definition."

"I understand you want to rewrite the Obama policy on Russia, but that is simply not true."

"What I am trying to suggest to you is that what the President says is U.S. policy because our allies and our adversaries make decisions based upon those comments."

"What is most important is that those two statements link, is that they have agreed to denuclearize according to our definition of denuclearization."