Chris Diamantopoulos has been tapped to play the series regular role of Rob Weiss, the argumentative and tough new Chief of Staff to President Allison Taylor (Cherry Jones). He replaces Taylor's current C.O.S., Ethan Kanin.
Day 8's action will switch from Washington D.C. to New York City and center on an assassination plot against a visiting foreign leader.
Diamantopoulos is married to Ugly Betty's sublime Becki Newton.