Oh no, why should HE be investigated? I mean, it was the big O who nominated him. That, in itself, is cause for deep concern AND an investigation.
But this has always bothered me:
".... And during a 25-year career in government, I was privileged to serve in positions across the Middle East — as a political officer with the State Department and as a CIA station chief in Saudi Arabia. In Saudi Arabia, I saw how our Saudi partners fulfilled their duty as custodians of the two holy mosques of Mecca and Medina. I marveled at the majesty of the Hajj and the devotion of those who fulfilled their duty as Muslims by making that privilege — that pilgrimage...."
http://www.snopes.com/fact-check/cia-director-john-brennan-muslim/
No wonder the Big O nominated him, supported him and practically kissed him to death. THEY SHARE THE SAME RELIGION, how do ya like that?
Oh yes, I know people can/and will argue this forever.
It doesn't seem plausible by any means.
More on the priiiick:
http://en.wikipedia.org/wiki/John_O._Brennan