Buzzfeed has a portrait ("The Untouchable John Brennan") of John Brennan, the director of the CIA.
Brennan defended torture, played a very important role in the drone killings and managed to get away with spying on the Senate. The key: he has a very close relationship with Obama.
The article also mentions that he spent two periods of several years in Saudi Arabia. It doesn't elaborate on that, but it may very well be the explanation why the Obama administration is so eager to do what the Saudi's want: a.o. in Syria, and now in Yemen.