Who knew about Brennan's concerns on the Hill: Brennan also said he briefed the "full details" to Harry Reid, Mitch McConnell, Dianne Feinstein, Richard Burr, Paul Ryan, Devin Nunes, Adam Schiff, and the Gang of Eight between August 11 and September 6 of last year.

Trump's disclosure to the Russian officials in the Oval violated two protocols if the reports are true; first that such classified information is not shared with visiting Ambassadors or foreign officials — it must go through established channels — and second that before sharing any classified intel, the originating agency must verify no sources or methods will be revealed.

On collusion with Russia: Brennan said when he left office January 20 this year he had "unresolved questions" in his mind about whether U.S. persons may have been unwittingly or wittingly helping Russia. He would not reveal if this was Trump, campaign aides to Trump, or just people associated with Trump.

"I don't know whether such collusion existed...I don't know...but I know there was a sufficient basis of information and intelligence that required further investigation by the bureau to determine whether U.S. persons were actively conspiring or colluding with Russian officials."

On the Trump-Russia Steele dossier: "It wasn't part of the corpus of intel information we had…it was not used in any way as a basis." Why didn't the CIA use it? "Because we didn't."

On what Russia's doing right now: "I believe the Russians are trying to actively exploit what is going on in Washington right now to their benefit and to our detriment."