US Senator Lindsey Graham, a prominent Republican who shifted from a vocal critic of Donald Trump to one of his most loyal allies after Trump's presidency, has died at 71 following a brief illness.His office confirmed the death on Sunday, with emergency responders attending to a cardiac arrest incident at his Capitol Hill home.

Graham's passing impacts Senate dynamics as Republicans seek control in November elections, though South Carolina's reliably Republican status mitigates immediate shifts.

Trump praised Graham as a 'true American Patriot,' while Ukrainian President Zelensky and Israeli PM Netanyahu expressed deep sorrow over his death.Graham was a staunch supporter of Israel and Ukraine, recently advocating for China's role in pressuring Russia to end the war in Ukraine.

His career spanned decades in Congress, including roles on key committees, and he remained a vocal critic of Trump's policies despite their alignment.

The contest to replace him will involve a temporary appointment by Governor McMaster and an expedited primary election, with the nominee not necessarily matching the interim choice.Graham's legacy includes his defense hawk stance, support for Ukraine, and controversial comments on Trump's 2016 campaign.