Lindsey Graham, the garrulous son of South Carolina pool hall owners, rose to become a fixture on the global stage and one of the most prominent advocates of American military might in the U.S. Senate.

A former military lawyer who reached the rank of colonel in the Air Force, the wisecracking Graham was known for his Southern drawl, political flexibility and reliably hawkish stance on foreign policy. He ran for the Republican presidential nomination in 2016 as a determined opponent of Donald Trump, then became one of the new president’s staunchest allies.