US Senator Lindsey Graham dies after 'brief and sudden illness'

US Republican Senator Lindsey Graham has died following a brief and sudden illness.

His office has released a statement saying he died on Saturday evening. "Senator Graham's family appreciates prayers at this time and asks for privacy during this incredibly difficult period."

Graham was chairman of the Senate Budget Committee and was seeking a fifth six-year Senate term in November.

He was one of the most well-known members of the chamber and a key voice within the party on defense and international affairs.

Emergency personnel responded to a call for “cardiac arrest” at Graham’s Capitol Hill home on Saturday night, according to police scanner audio.