When I asked Secretary Gates if the US had evidence of more secret nuclear sites in Iran, he would only say "we're watching very closely." But his tight-lipped smile sure seemed like a "tell."
Here's the exchange...
STEPHANOPOULOS: US intelligence had been tracking this site for quite some time before President Obama made it public. Is this the only secret site that we know of?
GATES: Well, I’m not going to get into that. I would just say that we’re watching very closely.
STEPHANOPOULOS: Does the US government believe that Iran has an active nuclear weapons program?
GATES: I think, my personal opinion is that the Iranians have the intention of having nuclear weapons. I think the question of whether they have made a formal decision to move towards the development of nuclear weapons, uh, is in doubt. - George Stephanopoulos