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Former Republican presidential candidate and South Carolina Sen. Lindsey Graham will endorse former Florida Gov. Jeb Bush for president.

A spokesperson for Graham confirmed to CNN that Graham, from the crucial early primary state South Carolina, will endorse Bush’s White House bid from a Charleston hotel Friday morning.

According to a source close to Graham, national security has always been the most important issue for the senator and Graham thinks he has found the next Commander-in-Chief.

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 will make his official endorsement announcement Friday at 9:45 a.m.