The Senate majority leader is unflappable. Despite pressure stemming from both John Bolton's willingness to testify and constant criticism from Democratic leaders, Mitch McConnell is confident he can start the impeachment trial without committing to witnesses. Plus, will Senators from either party cross party lines when it comes to setting the trial rules? CNN political director David Chalian examines what the Senate trial will look like with CNN Chief National Correspondent John King and CNN Legal Analyst Ross Garber.

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