White House never was told!
It seems to me that we were hearing that Obama was not attending the weekly intel meetings at the White House. Perhaps he and Joe would know what is going on if they were doing their jobs instead of playing golf.
They are either lying or are incompetent. Given all the varying answers from Obama and his staff I can only conclude both are true. Given Biden's inability to listen to his debate opponent I would guess if he had been informed of the ambassador's request for more security he was not listening.