Classified: Keeping close the nation's secrets

The documents spread out on the carpet at Mar-a-Lago, their classification markings clearly visible, are tiny drops in a tsunami of secrets kept by the U.S. government.

CBS News national security correspondent David Martin asked John Fitzpatrick, who managed the flow of classified documents in both the Obama and Trump White Houses, "Do you have any estimate of how many classified documents there are?"

"That's really unknowable," he replied.