Los Angeles [US], September 26 (ANI): The hit Netflix political drama 'The Diplomat' seems to have added more familiar faces to its lineup.

According to The Hollywood Reporter, Emmy-winning actors Allison Janney and Bradley Whitford have been promoted to series regulars for Season 4 .

The two also appeared as guest stars in Season 3 , which is set to premiere on October 16.

Janney joined the show in Season 2 and plays Vice President Grace Penn, who will step into the role of President following the shocking death of President William Rayburn (Michael McKean) at the end of Season 2. Whitford plays her husband, Todd Penn, who develops what the show describes as an "unnerving bond" with Ambassador Kate Wyler, played by Keri Russell.

The fourth instalment is scheduled to begin shooti

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