Read on: DeadlineSec. McCord’s Chief of Staff Nadine Tolliver is leaving the State Department – for good. Bebe Neuwirth announced Sunday night in a series of tweets that she had decided to leave CBS’ Madam Secretary. Neuwirth has been a series regular since the political drama premiered in 2014. 1/3 So grateful for my time @MadamSecretary – a wonderful show where I love the cast, crew, background artists.