The following script is from "28 Pages" which aired on April 10, 2016. Steve Kroft is the correspondent. Howard Rosenberg and Julie Holstein, producers.

In 10 days, President Obama will visit Saudi Arabia at a time of deep mistrust between the two allies, and lingering doubts about the Saudi commitment to fighting violent Islamic extremism.

It also comes at a time when the White House and intelligence officials are reviewing whether to declassify one of the country's most sensitive documents -- known as the "28 pages." They have to do with 9/11 and the possible existence of a Saudi support network for the hijackers while they were in the U.S.