U.S. Senator Lindsey Graham, a Republican from South Carolina and long-time figure in American foreign policy, dies at age 71 after what his office describes as a “brief and sudden illness.” Multiple outlets report that he had been campaigning for a fifth Senate term in this year’s midterm elections. His death prompts tributes from U.S. and international leaders.

Graham, first elected to the Senate in 2002, previously served in the U.S. Air Force as a military lawyer. Over two decades in Congress, he becomes known for advocacy on national security and foreign policy, including strong positions on Iran and support for Ukraine during Russia’s full-scale invasion. In recent years, he is also closely associated with President Donald Trump, with a relationship that evolved from early clashes to later cooperation.

Tributes include statements by Trump, Senate Majority Leader John Thune, and leaders including Israeli Prime Minister Benjamin Netanyahu and Ukrainian President Volodymyr Zelensky. South Carolina Governor Henry McMaster describes Graham as “irreplaceable.” Graham’s office releases limited details, and his family asks for privacy. Under state law, Gov. McMaster will appoint a temporary successor until January.