CIA releases 2,500 top secret US Presidential briefings from the 1960s
The CIA have released 2,500 previously classified briefings, which were presented to Presidents John F Kennedy and Lyndon B Johnson during their time in office.
The 'President's Daily Brief' is a summary of potential global threats compiled by the US intelligence agencies.
The briefing is delivered personally to the sitting US President every morning.
John Negroponte, former US director of National Intelligence, was the man who delivered the daily briefing to President George W Bush.
This week he spoke to the BBC World Service and gave a unique insight into this daily task.
"A typical brief will have six or seven articles, usually not exceeding one page, sometimes just a paragraph.
"And then one or two longer 'deep dive' pieces.
"Just before 8am we would go to the outer office of the president and wait until he was ready.
"He took that briefing every day of the week, Monday through Friday, and Saturdays as well.
"He was very disciplined about it, and he was what the intelligence community would call an excellent customer," Negroponte said
The former intelligence chief said that Bush was very interested in the information presented to him and was 'anything but passive'.
"He'd interrupt and say 'I don't really believe that, let's talk about this' or 'would you please look into this part more?' or 'could you also answer this question?'
"He had a dialectic style where he liked to come to a better understanding of what was being presented to him through discussion and debate," Negroponte added.