Lindsey Graham, who was elected to the Senate in 2003 and was a close political ally of President Donald Trump, has died at the age of 71, his office confirmed early Sunday.

Graham died Saturday night “from a brief and sudden illness,” his office said in a statement.

“Senator Graham’s family appreciates prayers at this time and asks for privacy during this incredibly difficult period,” the statement continued.

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 defence 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 obtained by NBC News.

Photographs reviewed by NBC News show that paramedics carried a person on a stretcher from Graham’s home to an awaiting ambulance. Police cars and fire trucks were also on site.

Graham was fresh off a trip to Kyiv, Ukraine, where he met with Ukrainian President Volodymyr Zelenskyy on Friday. He had been scheduled to appear on NBC News’ “Meet the Press” on Sunday.

His death comes as fellow Republican Senator Mitch McConnell remains in the hospital after paramedics responded to a call at a known residence last month for an individual experiencing cardiac arrest.

A McConnell spokesperson has said the former GOP majority leader is continuing to recover, but his team has not provided further details about his condition.

-NBC News