Senator Lindsey Graham, a vocal proponent of aid to Ukraine and a critic of the Russian regime, died suddenly on Saturday, prompting concerns and calls for a comprehensive investigation into the cause of his death. Graham, 71, had recently returned from a trip to Ukraine and expressed strong support for increased international pressure and sanctions against Russia.
His office initially attributed his death to a "brief and sudden illness." While preliminary medical examinations reportedly suggest an aortic dissection related to hardened arteries, some observers have raised suspicions due to Graham's prominent stance against Vladimir Putin's government. Sir William (Bill) Browder, a financier and vocal critic of Putin, emphasized the importance of U.S. investigators ruling out foul play.
"When a person who is an enemy of Putin's dies suddenly and unexpectedly, one should of course look at all the different possibilities," Browder told the Daily Mail. "And Lindsey Graham was a big enemy of Putin, and he was specifically a very relevant enemy to Putin in the last few days."
Browder highlighted a history of suspected poisonings of Putin's opponents, including Alexei Navalny, Alexander Litvinenko, and Yuri Shchekochikhin. He also cited the case of Canadian politician Irwin Cotler, who reported being poisoned during a 2006 visit to Moscow. Cotler, a former minister of justice, had represented Russian dissidents and advocated for opponents of the Kremlin. He described becoming violently ill after a dinner in Moscow and later received an apology from Russian Embassy officials who suggested his poisoning was a "mistake."
Other alleged poisoning incidents involving individuals critical of the Russian government include that of Ukrainian President Viktor Yushchenko in 2004, who survived but was left permanently disfigured. Alexander Litvinenko, a former KGB agent, died in London in 2006 from polonium-210 poisoning, an incident both a UK public inquiry and the European Court of Human Rights attributed to Russia, likely with Putin's personal approval.
More recently, in 2018, former Russian spy Sergei Skripal and his daughter Yulia were found unconscious in Salisbury, England, after being exposed to the nerve agent Novichok. A police officer who searched their home also became critically ill. The attack led to widespread diplomatic expulsions of Russian officials.
Alexei Navalny, a prominent Russian opposition leader, died in a Siberian prison in 2024. He had previously survived a Novichok poisoning in 2020, with German doctors confirming traces of the nerve agent in his system. Investigative journalists later claimed that members of the FSB spy agency had applied Novichok to the inner seams of his boxer shorts.
Vladimir Kara-Murza, a political activist and journalist, reportedly survived two poisonings in 2015 and 2017, each time suffering multiple organ failure. While Russian authorities denied requests for criminal investigations, media investigators noted that the same FSB unit that surveilled Navalny had also followed Kara-Murza.
Yuri Shchekochikhin, an investigative journalist and politician, died suddenly in 2003 from an illness that colleagues and family suspected was poisoning, intended to prevent him from uncovering a corruption scandal. Russian authorities attributed his death to an "unknown allergen" but classified his medical test results.
The medical examiner's office has not yet formalized Senator Graham's cause of death, with toxicology and microscopic testing results pending. Browder stressed that while he was not asserting Graham died from unnatural causes, it was crucial for U.S. authorities to thoroughly investigate all possibilities to avoid a potential "horrible injustice."