Sen. Lindsey Graham, R-S.C., spent his final days meeting foreign leaders, pressing for a tougher U.S. stance against Russia and planning Sunday television appearances before his unexpected death capped a career defined by an assertive approach to American foreign policy.
Graham died Saturday night at age 71 after returning to Washington from a trip to Turkey and Ukraine.
A preliminary report from the Office of the Chief Medical Examiner said he likely died from an aortic dissection stemming from arteriosclerotic cardiovascular disease, though additional testing is pending.
The South Carolina Republican had just completed a whirlwind diplomatic tour that underscored the role he carved out as one of the Senate's most influential foreign policy voices, according to reports from The Wall Street Journal and The New York Times.
His final public appearance came Friday in Kyiv after meeting with Ukrainian President Volodymyr Zelenskyy.
Graham announced he had reached an agreement with bipartisan lawmakers and the White House on a revised Russia sanctions package targeting buyers of Russian oil, calling it a breakthrough that could help end Moscow's war against Ukraine.
"I've never been more optimistic than I am today," Graham said after the meeting, expressing confidence the legislation would become law.
The trip followed a NATO summit in Ankara, Turkey, where Graham worked behind the scenes to build support for the sanctions measure.
The longtime Republican hawk also met with NATO Secretary-General Mark Rutte, Syrian President Ahmed al-Sharaa and senior Trump administration officials, including Treasury Secretary Scott Bessent.
According to the Journal, Graham believed securing White House backing for the sanctions legislation was a critical step after months of lobbying President Donald Trump and administration officials.
Trump said he spoke with Graham after the senator returned to Washington and noticed only that he was tired from the overseas trip.
"Honestly, he was a great politician," Trump said Sunday on NBC's "Meet the Press." "I thought Lindsey was going to be living forever."
Hours later, emergency responders were dispatched to Graham's Capitol Hill home after reports of chest pains.
The senator was pronounced dead at George Washington University Hospital at 10:23 p.m., according to the Metropolitan Police Department.
Graham's death came just weeks after he won the Republican primary for what would have been his fifth Senate term.
Under South Carolina law, Gov. Henry McMaster will appoint an interim replacement through Jan. 3, 2027, while a special election process begins to choose the GOP nominee for the November ballot.
Trump has ordered U.S. flags flown at half-staff through Saturday in Graham's honor as congressional leaders prepare tributes for one of the Senate's most recognizable Republican voices and a steadfast advocate of a muscular American foreign policy.