US Senator Lindsey Graham has died after a brief and sudden illness, his office has confirmed. The influential politician had just returned from Kyiv, where he met with Ukraine's President Volodymyr Zelensky on Friday, according to reports.

Details of his cause of death are still unclear, but Senator Graham was widely known for his vocal support of Ukraine and the US's military aid to the country. His recent visit to Kyiv was seen as a significant development in the ongoing conflict.

US politician Lindsey Graham during a visit to Ukraine

Senator Lindsey Graham was a senior member of the US Senate, serving as the Chair of the Senate Judiciary Committee and a key member of the Senate Armed Services Committee. He was a vocal advocate for a strong US military and was a key supporter of Ukraine's struggle against Russian aggression.

In a statement, his office said: 'Senator Graham is remembered for his steadfast commitment to public service and his unwavering dedication to the values of our nation.'

The news of his death has sent shockwaves through the US Congress, with many of his colleagues paying tribute to his service and legacy. His passing has been met with an outpouring of condolences from politicians, diplomats, and world leaders around the globe.