On policing, what happens in communities on the ground often has to do with the tone set by the brass. So what happens when the President stokes his base by applauding rough policing? On today's show, Chuck Rosenberg, MSNBC contributor and host of "The Oath" podcast, former US attorney, senior FBI official and acting head of the DEA, talks about the new season of his podcast, a series of interviews with former government officials about what the oath of office meant to them, plus offers his take on national security news.