Sen. Lindsey Graham told one of his staffers that he was experiencing chest pains and to call 911 shortly before his sudden death Saturday night, one of Graham’s Republican colleagues told reporters Monday.

The comments by Sen. Tommy Tuberville (R-Ala.) shed new light on Graham’s final hours after he returned from a trip to Ukraine and prepared to return to work following Congress’ post-4th of July recess, despite feeling unwell.

Tuberville recounted that one of his former schedulers, who was also Graham’s scheduler, was with a staff member watching a World Cup soccer match at a Washington, D.C.-area restaurant when Graham called.

"Lindsey called [and] basically said, 'Listen, I’m having chest pains. You know, I need to do something,'" Tuberville said. "[She said] ‘Did you call 911?’ And he goes, ‘No, that’s reason I called you.’ And so she called 911 … By the time she got there, 911 had knocked the door down, and they were working on him."

Emergency dispatch audio previously reviewed by The Post indicates that paramedics were dispatched to Graham’s Capitol Hill townhouse around 8:30 p.m. Saturday. Shortly before 9 p.m., emergency personnel reported that CPR was in progress and a man at the house was suffering from cardiac arrest.

Graham’s office announced his death shortly after 2 a.m. Sunday. The D.C. medical examiner’s office issued a preliminary finding that his death was caused by an aortic dissection brought about by arteriosclerotic cardiovascular disease.

Axios reported earlier Monday that Graham had told another person Saturday evening that he was feeling unwell and would go to the doctor following a scheduled appearance on NBC News’ “Meet The Press.”

"I can’t die now," Graham reportedly joked. "I still need to do the Russia sanctions, get Iran sorted out and do Israeli-Saudi normalization."

As senators returned to work Monday, Tuberville suggested that the South Carolinian "worked himself to death."

"Most of us have families," the Alabama Republican said. "He didn’t have any family, and if we had a couple of days off, he went to that airport. He went somewhere to try to work out something for our country."