Keri Russell Confronts a “Culture of Consistent Lawlessness” in ‘The Diplomat’ Season 4 Trailer

The latest preview for the Netflix political thriller, set to return Oct. 15, ratchets up the tension as Russell's American ambassador to the U.K. confronts her vice president husband (Rufus Sewell) and president Grace Penn (Allison Janney) about their possibly "over the line," approach to foreign policy.