Robert Joseph: “I think Iran will use nuclear weapons. They will use it to intimidate. They will use it to blackmail us.”

The New START treaty does not prevent the United States or Russia from developing new strategic nuclear weapon capabilities.

I think it is imperative to demonstrate U.S. leadership in order to keep those sanctions on Iran...

We don't back up what we say. We don't impose consequences for red lines that are established and then crossed.

My skepticism is that we continue to apply cold-war approaches in our relationship with Russia.