Physician reveals stunning factor that may have contributed to Lindsey Graham’s death

Primary care physician Marc Siegel pointed to a surprising factor Sunday that may have contributed to Sen. Lindsey Graham's (R-SC) sudden and unexpected death, a factor related to his strong support for Israel and Ukraine.Graham was taken to George Washington University Hospital Saturday night in Washington, D.C. after potentially suffering from cardiac arrest, according to reports. Graham’s office announced the senator’s death in a statement several hours later.During an appearance on Fox News’ “Fox Friends” Sunday morning, Siegel said that Graham’s death was “most likely” due to a “heart attack” based on available reporting, and when asked to comment on Graham’s seemingly good health just one day before the incident, proposed a potential factor in the senator’s sudden death: his frequent long plane flights.“You go on a long plane flight, you can develop blood clots, which could be another cause of this – you could have a pulmonary embolism,” Siegel said. “But most of the time, this ends up being an arrhythmia or a sudden heart attack where you don't get enough blood flow to the heart.”Being among Congress’ strongest supporters of Israel and Ukraine, Graham has taken countless flights to both countries over the past several years. Graham’s most recent trip to Ukraine was his 10th visit, and in 2024, he made his fifth visit to Israel since October of 2023. Both flights would have been several hours long.“Here's something about plane flights that people don't know – it's not just that you're sitting there and that you can build up a chance of a blood clot,” Siegel continued. “Did you know that the oxygen content in the cabin is never exactly what you want it to be? So if you're having an issue with your heart, you're more likely to bring it on because of plane flight because you're not getting the same amount of oxygen pressure that you would outside of a plane.”Physician @DrMarcSiegel suggests that Lindsey Graham’s frequent flights (he’s taken well over a dozen trips to Israel and Ukraine over the past several years) may have actually contributed to his sudden death pic.twitter.com/dB6VZM4d8W— Alexander Willis (@ReporterWillis) July 12, 2026