US TV
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According to Entertainment Weekly, the actor - best known for playing Debra Messing's gay best friend on The Starter Wife - has been given a regular role on the show's eighth season.
Diamantopoulos will play Rob Weiss, the new Chief of Staff to President Allison Taylor, replacing the current Ethan Kanin.
The star has also previously appeared in American Dad! and CSI.
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2012-13 Season
John Stamos to star in 'Little Brother'The former Full House actor will star in the comedy pilot Little Brother.
US TV Interviews
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US TV Ratings
'Blue Bloods', 'Grimm' rise on FridayCBS beats ABC to win Friday night's ratings battle, thanks to Blue Bloods.
