How the Trump-Russia Investigation Began - Ball of Collusion, Part 1

Former Chief Assistant U.S. Attorney Andrew C. McCarthy joins Greg Corombos for an indepth conversation about McCarthy's new book, "Ball of Collusion: The Plot to Rig an Election and Destroy a Presidency." In this first installment, they discuss whether the initial investigation into allegations of a Trump-Russian conspiracy were based on concrete evidence or the desire to find something. They also examine the role of then-CIA Director John Brennan in the early stages of the probe.Finally, McCarthy responds to critics who insist he is wrong to conclude President Obama knew about the investigation during the 2016 campaign, pointing out it would be far worse for the president NOT to know that a major party nominee was allegedly conspiring with a foreign adversary.