Former CIA Director John Brennan explained to MSNBC's Lawrence O'Donnell on Tuesday night why President Trump overriding intelligence officials and his own staff to give security clearances to his daughter Ivanka Trump and son-in-law Jared Kushner would be such a big deal, as well as an unprecedented one. He also said he heard "a lot of tantalizing tidbits" from Michael Cohen's public testimony last week, specifically the still-under-wraps federal criminal investigations involving Trump. And he hazarded a guess about when Special Counsel Robert Mueller's investigation would wrap up, and how.

"I think Robert Mueller wants to be able to conclude his work and turn over the investigative threads to the Southern District of New York, the Eastern District of Virginia, and other jurisdictions as appropriate," Brennan said. "I wouldn't be surprised if, for example, this week on Friday — not knowing anything about it — but Friday is the day that the grand jury indictments come down." And this Friday, he said, is better than next Friday, the Ides of March, for Mueller to hand in "what I think are going to be his indictments, the final indictments, as well as the report that he gives to the attorney general."