Leon Panetta: “We have a responsibility, and I take that responsibility seriously, to do everything we can to protect our citizens.”

You know, Erin, as CIA director, I had an awful lot of intelligence on Putin and his background, and his trustworthiness. And the bottom line is that it was clear that we could never trust Putin's word.

The message that went out from this meeting to the world is that United States credibility in dealing with our allies has taken a real hit.

I recommend he take Reagan's position, which is trust, but verify.

The answer is no, not at all. Not in 100 years. These plans that the Pentagon develops, we -- we develop these plans to deal with every potential crisis that's out there.