MSNBC's Ari Melber reports on the ongoing manhunt for the person who shot and killed conservative activist Charlie Kirk. Plus, new revelations on the Jeffrey Epstein scandal are rattling President Trump. Former ATF Director Steven Dettelbach and Bloomberg's Jason Leopold join.

New details emerge in the Charlie Kirk murder investigation. Plus, Trump White House aide Peter Navarro joins MSNBC's Ari Melber on "The Beat" for an extended conversation.