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Graham, 71, was a prominent Republican senator from South Carolina. Earlier in his career, he was a vocal critic of US President Donald Trump before becoming one of his most loyal allies.
The influential politician had just returned from Kyiv, where he met Ukraine's President Volodymyr Zelensky on Friday.
Lindsey Graham was first elected to the United States Senate in 2002.
President Trump paid tribute to the late senator, who was reportedly scheduled to do an interview on Sunday.
Republican South Carolina Sen. Lindsey Graham has died at 71 from a "brief and sudden illness." Emergency personnel responded to a call for "cardiac arrest" at Graham's Capitol Hill home.
Lindsey Graham, R-S.C., who was elected to the Senate in 2003 and was a close political ally of President Donald Trump, has died, his office confirmed early Sunday. He was 71.
