Chris Murphy actually said...

"There are undoubtedly plenty of examples in which diplomacy has gone wrong, in which we signed a deal that did not work out for the best interests of American national security."

"I think the benefits outweigh the risks."

"So when they are enriching like crazy and we have passed up diplomacy and we have passed up the Non-Proliferation Treaty, which option is left to us to enforce this?"

"We would be turning away from the NPT. That is, part of this vote would be basically saying we do not trust the NPT."