GREG MILLER:

Yes, it's really remarkable, the precautions that the administration was taking with this information.

This intel, when it's delivered to the White House, is brought by courier in an envelope with restricted markings on it. It's eyes only, which means it can only be shared with the four people who are named on the envelope, President Obama and three of his senior aides.

They then they have, when they're done reading this thing, put it back in the envelope, send it straight back to the CIA. It sets in motion a series of meetings, high-level meetings at the White House in the Situation Room. Only four senior officials are initially allowed to participate, although that circle begins to widen in the ensuing weeks.

And even there, there are things that I didn't know about how the White House works that, apparently, in the Situation Room, there are video cameras that send feeds to other offices in the White House, so that others sitting at their desks can monitor what's happening in that room. All those feeds were shut off for all of these discussions. The only time that had ever happened before was in the run-up to the bin Laden operation in 2011.