( CNN) In the last few weeks the two presidential nominees have received their initial intelligence briefings. Although the experience must have been different for each — it was Donald Trump's first, whereas Hillary Clinton is an experienced intelligence consumer — the latter are both recipients of a product authorized by President obama, the intelligence community's most important client and the official who more than anyone else controls how intelligence is shared within and outside the US government.

For years the CIA shielded from public view every single one of the briefings that it renders daily for the president's eyes merely, arguing that even letting go one 50 -year old briefing could harm national security.