Graham has been a coveted endorsement for candidates running for the Republican nomination since he holds major clout in South Carolina, one of the critical early voting primary states.
Bush was initially considered a heavy contender for the Republican nomination for president, but his campaign eventually lagged behind candidates like businessman Donald Trump and Texas Sen. Ted Cruz who have positioned themselves as anti-establishment alternatives.
Bush called Graham “probably the most knowledgeable person on the Hill as it relates to national security, military, foreign policy.”
“His endorsement is very meaningful, and along with it come a lot of friends and supporters of his. So I’m excited about it,” Bush told Fox News on Friday.
Graham launched his own presidential campaign last summer, but dropped out of the race last month having mustered little support in the polls.